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Annotation of 43BSDTahoe/etc/named/db.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1985 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 the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)db.h        4.14 (Berkeley) 6/18/88
        !            18:  */
        !            19: 
        !            20: /*
        !            21:  * Global structures and variables for data base routines.
        !            22:  */
        !            23: 
        !            24: #define INVBLKSZ       7       /* # of namebuf pointers per block */
        !            25: #define INVHASHSZ      919     /* size of inverse hash table */
        !            26: 
        !            27:        /* max length of data in RR data field */
        !            28: #define MAXDATA                256
        !            29: 
        !            30: /*
        !            31:  * Hash table structures.
        !            32:  */
        !            33: struct databuf {
        !            34:        struct  databuf *d_next;        /* linked list */
        !            35:        u_long  d_ttl;                  /* time to live */
        !            36:        short   d_flags;
        !            37:        short   d_zone;                 /* zone number */
        !            38:        short   d_class;                /* class number */
        !            39:        short   d_type;                 /* type number */
        !            40:        short   d_mark;                 /* place to mark data */
        !            41:        short   d_size;                 /* size of data area */
        !            42:        u_long  d_nstime;               /* NS response time, milliseconds */
        !            43:        char    d_data[MAXDATA];        /* the data is malloc'ed to size */
        !            44: };
        !            45: #define DATASIZE(n) (sizeof(struct databuf) - MAXDATA + n)
        !            46: 
        !            47: /*
        !            48:  * d_flags definitions
        !            49:  */
        !            50: #define DB_F_HINT       0x01   /* databuf belongs to fcachetab */
        !            51: 
        !            52: struct namebuf {
        !            53:        char    *n_dname;               /* domain name */
        !            54:        u_int   n_hashval;              /* hash value of n_dname */
        !            55:        struct  namebuf *n_next;        /* linked list */
        !            56:        struct  databuf *n_data;        /* data records */
        !            57:        struct  namebuf *n_parent;      /* parent domain */
        !            58:        struct  hashbuf *n_hash;        /* hash table for children */
        !            59: };
        !            60: 
        !            61: struct invbuf {
        !            62:        struct  invbuf *i_next;         /* linked list */
        !            63:        struct  namebuf *i_dname[INVBLKSZ];     /* domain name */
        !            64: };
        !            65: 
        !            66: struct hashbuf {
        !            67:        int     h_size;                 /* size of hash table */
        !            68:        int     h_cnt;                  /* number of entries */
        !            69:        struct  namebuf *h_tab[1];      /* malloc'ed as needed */
        !            70: };
        !            71: #define HASHSIZE(s) (s*sizeof(struct namebuf *) + 2*sizeof(int))
        !            72: 
        !            73: #define HASHSHIFT      3
        !            74: #define HASHMASK       0x1f
        !            75: 
        !            76: /*
        !            77:  * Flags to updatedb
        !            78:  */
        !            79: #define DB_NODATA      0x01    /* data should not exist */
        !            80: #define DB_MEXIST      0x02    /* data must exist */
        !            81: #define DB_DELETE      0x04    /* delete data if it exists */
        !            82: #define DB_NOTAUTH     0x08    /* must not update authoritative data */
        !            83: #define DB_NOHINTS      0x10   /* don't reflect update in fcachetab */
        !            84: 
        !            85: #define DB_Z_CACHE      (0)    /* cache-zone-only db_dump()  */
        !            86: #define DB_Z_ALL        (-1)   /* normal db_dump() */
        !            87: 
        !            88: /*
        !            89:  * Error return codes
        !            90:  */
        !            91: #define OK             0
        !            92: #define NONAME         -1
        !            93: #define NOCLASS                -2
        !            94: #define NOTYPE         -3
        !            95: #define NODATA         -4
        !            96: #define DATAEXISTS     -5
        !            97: #define NODBFILE       -6
        !            98: #define TOOMANYZONES   -7
        !            99: #define GOODDB         -8
        !           100: #define NEWDB          -9
        !           101: #define AUTH           -10
        !           102: 
        !           103: extern struct hashbuf *hashtab;                /* root hash table */
        !           104: extern struct invbuf *invtab[];                /* inverse hash table */
        !           105: extern struct hashbuf *fcachetab;      /* hash table for cache read from file*/
        !           106: 
        !           107: extern struct namebuf *nlookup();
        !           108: extern struct namebuf *savename();
        !           109: extern struct databuf *savedata();
        !           110: extern struct databuf *rm_datum();
        !           111: extern struct hashbuf *savehash();
        !           112: extern struct invbuf *saveinv();
        !           113: extern char *savestr();
        !           114: extern char *malloc(), *realloc(), *calloc();

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