usr/src/usr.sbin/named/db.h

/*
 * Copyright (c) 1985, 1990 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)db.h        4.16 (Berkeley) 6/1/90
 */

/*
 * Global structures and variables for data base routines.
 */

#define INVBLKSZ        7       /* # of namebuf pointers per block */
#define INVHASHSZ       919     /* size of inverse hash table */

        /* max length of data in RR data field */
#define MAXDATA         2048

/*
 * Hash table structures.
 */
struct databuf {
        struct  databuf *d_next;        /* linked list */
        u_long  d_ttl;                  /* time to live */
        short   d_flags;
        short   d_zone;                 /* zone number */
        short   d_class;                /* class number */
        short   d_type;                 /* type number */
        short   d_mark;                 /* place to mark data */
        short   d_size;                 /* size of data area */
        u_long  d_nstime;               /* NS response time, milliseconds */
        char    d_data[1];              /* the data is malloc'ed to size */
};
#define DATASIZE(n) (sizeof(struct databuf) - 1 + n)

/*
 * d_flags definitions
 */
#define DB_F_HINT       0x01    /* databuf belongs to fcachetab */

struct namebuf {
        char    *n_dname;               /* domain name */
        u_int   n_hashval;              /* hash value of n_dname */
        struct  namebuf *n_next;        /* linked list */
        struct  databuf *n_data;        /* data records */
        struct  namebuf *n_parent;      /* parent domain */
        struct  hashbuf *n_hash;        /* hash table for children */
};

struct invbuf {
        struct  invbuf *i_next;         /* linked list */
        struct  namebuf *i_dname[INVBLKSZ];     /* domain name */
};

struct hashbuf {
        int     h_size;                 /* size of hash table */
        int     h_cnt;                  /* number of entries */
        struct  namebuf *h_tab[1];      /* malloc'ed as needed */
};
#define HASHSIZE(s) (s*sizeof(struct namebuf *) + 2*sizeof(int))

#define HASHSHIFT       3
#define HASHMASK        0x1f

/*
 * Flags to updatedb
 */
#define DB_NODATA       0x01    /* data should not exist */
#define DB_MEXIST       0x02    /* data must exist */
#define DB_DELETE       0x04    /* delete data if it exists */
#define DB_NOTAUTH      0x08    /* must not update authoritative data */
#define DB_NOHINTS      0x10    /* don't reflect update in fcachetab */

#define DB_Z_CACHE      (0)     /* cache-zone-only db_dump()  */
#define DB_Z_ALL        (-1)    /* normal db_dump() */

/*
 * Error return codes
 */
#define OK              0
#define NONAME          -1
#define NOCLASS         -2
#define NOTYPE          -3
#define NODATA          -4
#define DATAEXISTS      -5
#define NODBFILE        -6
#define TOOMANYZONES    -7
#define GOODDB          -8
#define NEWDB           -9
#define AUTH            -10

extern struct hashbuf *hashtab;         /* root hash table */
extern struct invbuf *invtab[];         /* inverse hash table */
extern struct hashbuf *fcachetab;       /* hash table for cache read from file*/

extern struct namebuf *nlookup();
extern struct namebuf *savename();
extern struct databuf *savedata();
extern struct databuf *rm_datum();
extern struct hashbuf *savehash();
extern struct invbuf *saveinv();
extern char *savestr();
extern char *malloc(), *realloc(), *calloc();