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Annotation of 43BSDTahoe/etc/named/db.h, revision 1.1.1.1

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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