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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)nameser.h   5.11 (Berkeley) 2/14/86
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Define constants based on rfc883
        !            11:  */
        !            12: #define PACKETSZ       512             /* maximum packet size */
        !            13: #define MAXDNAME       256             /* maximum domain name */
        !            14: #define MAXCDNAME      255             /* maximum compressed domain name */
        !            15: #define MAXLABEL       63              /* maximum length of domain label */
        !            16:        /* Number of bytes of fixed size data in query structure */
        !            17: #define QFIXEDSZ       4
        !            18:        /* number of bytes of fixed size data in resource record */
        !            19: #define RRFIXEDSZ      10
        !            20: 
        !            21: /*
        !            22:  * Internet nameserver port number
        !            23:  */
        !            24: #define NAMESERVER_PORT        53
        !            25: 
        !            26: /*
        !            27:  * Currently defined opcodes
        !            28:  */
        !            29: #define QUERY          0               /* standard query */
        !            30: #define IQUERY         1               /* inverse query */
        !            31: #define CQUERYM                2               /* completion query (multiple) */
        !            32: #define CQUERYU                3               /* completion query (unique) */
        !            33:        /* non standard */
        !            34: #define UPDATEA                100             /* add resource record */
        !            35: #define UPDATED                101             /* delete resource record */
        !            36: #define UPDATEM                102             /* modify resource record */
        !            37: #define ZONEINIT       103             /* initial zone transfer */
        !            38: #define ZONEREF                104             /* incremental zone referesh */
        !            39: 
        !            40: /*
        !            41:  * Currently defined response codes
        !            42:  */
        !            43: #define NOERROR                0               /* no error */
        !            44: #define FORMERR                1               /* format error */
        !            45: #define SERVFAIL       2               /* server failure */
        !            46: #define NXDOMAIN       3               /* non existent domain */
        !            47: #define NOTIMP         4               /* not implemented */
        !            48: #define REFUSED                5               /* query refused */
        !            49:        /* non standard */
        !            50: #define NOCHANGE       100             /* update failed to change db */
        !            51: 
        !            52: /*
        !            53:  * Type values for resources and queries
        !            54:  */
        !            55: #define T_A            1               /* host address */
        !            56: #define T_NS           2               /* authoritative server */
        !            57: #define T_MD           3               /* mail destination */
        !            58: #define T_MF           4               /* mail forwarder */
        !            59: #define T_CNAME                5               /* connonical name */
        !            60: #define T_SOA          6               /* start of authority zone */
        !            61: #define T_MB           7               /* mailbox domain name */
        !            62: #define T_MG           8               /* mail group member */
        !            63: #define T_MR           9               /* mail rename name */
        !            64: #define T_NULL         10              /* null resource record */
        !            65: #define T_WKS          11              /* well known service */
        !            66: #define T_PTR          12              /* domain name pointer */
        !            67: #define T_HINFO                13              /* host information */
        !            68: #define T_MINFO                14              /* mailbox information */
        !            69: #define T_MX           15              /* mail routing information */
        !            70:        /* non standard */
        !            71: #define T_UINFO                100             /* user (finger) information */
        !            72: #define T_UID          101             /* user ID */
        !            73: #define T_GID          102             /* group ID */
        !            74:        /* Query type values which do not appear in resource records */
        !            75: #define T_AXFR         252             /* transfer zone of authority */
        !            76: #define T_MAILB                253             /* transfer mailbox records */
        !            77: #define T_MAILA                254             /* transfer mail agent records */
        !            78: #define T_ANY          255             /* wildcard match */
        !            79: 
        !            80: /*
        !            81:  * Values for class field
        !            82:  */
        !            83: 
        !            84: #define C_IN           1               /* the arpa internet */
        !            85: #define C_CHAOS                3               /* for chaos net at MIT */
        !            86:        /* Query class values which do not appear in resource records */
        !            87: #define C_ANY          255             /* wildcard match */
        !            88: 
        !            89: /*
        !            90:  * Structure for query header, the order of the fields is machine and
        !            91:  * compiler dependent, in our case, the bits within a byte are assignd 
        !            92:  * least significant first, while the order of transmition is most 
        !            93:  * significant first.  This requires a somewhat confusing rearrangement.
        !            94:  */
        !            95: 
        !            96: typedef struct {
        !            97:        u_short id;             /* query identification number */
        !            98: #if defined (sun) || defined (sel) || defined (pyr) || defined (is68k) \
        !            99: || defined (tahoe) || defined (BIT_ZERO_ON_LEFT)
        !           100:        /* Bit zero on left:  Gould and similar architectures */
        !           101:                        /* fields in third byte */
        !           102:        u_char  qr:1;           /* response flag */
        !           103:        u_char  opcode:4;       /* purpose of message */
        !           104:        u_char  aa:1;           /* authoritive answer */
        !           105:        u_char  tc:1;           /* truncated message */
        !           106:        u_char  rd:1;           /* recursion desired */
        !           107:                        /* fields in fourth byte */
        !           108:        u_char  ra:1;           /* recursion available */
        !           109:        u_char  pr:1;           /* primary server required (non standard) */
        !           110:        u_char  unused:2;       /* unused bits */
        !           111:        u_char  rcode:4;        /* response code */
        !           112: #else
        !           113: #if defined (vax) || defined (BIT_ZERO_ON_RIGHT)
        !           114:        /* Bit zero on right:  VAX */
        !           115:                        /* fields in third byte */
        !           116:        u_char  rd:1;           /* recursion desired */
        !           117:        u_char  tc:1;           /* truncated message */
        !           118:        u_char  aa:1;           /* authoritive answer */
        !           119:        u_char  opcode:4;       /* purpose of message */
        !           120:        u_char  qr:1;           /* response flag */
        !           121:                        /* fields in fourth byte */
        !           122:        u_char  rcode:4;        /* response code */
        !           123:        u_char  unused:2;       /* unused bits */
        !           124:        u_char  pr:1;           /* primary server required (non standard) */
        !           125:        u_char  ra:1;           /* recursion available */
        !           126: #else
        !           127:        /* you must determine what the correct bit order is for your compiler */
        !           128:        UNDEFINED_BIT_ORDER;
        !           129: #endif
        !           130: #endif
        !           131:                        /* remaining bytes */
        !           132:        u_short qdcount;        /* number of question entries */
        !           133:        u_short ancount;        /* number of answer entries */
        !           134:        u_short nscount;        /* number of authority entries */
        !           135:        u_short arcount;        /* number of resource entries */
        !           136: } HEADER;
        !           137: 
        !           138: /*
        !           139:  * Defines for handling compressed domain names
        !           140:  */
        !           141: #define INDIR_MASK     0xc0
        !           142: 
        !           143: /*
        !           144:  * Structure for passing resource records around.
        !           145:  */
        !           146: struct rrec {
        !           147:        short   r_zone;                 /* zone number */
        !           148:        short   r_class;                /* class number */
        !           149:        short   r_type;                 /* type number */
        !           150:        u_long  r_ttl;                  /* time to live */
        !           151:        int     r_size;                 /* size of data area */
        !           152:        char    *r_data;                /* pointer to data */
        !           153: };
        !           154: 
        !           155: extern u_short getshort();
        !           156: extern u_long  getlong();

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