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Annotation of 43BSDReno/usr.sbin/named/db_save.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1986 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)db_save.c  4.15 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: /*
        !            25:  * Buffer allocation and deallocation routines.
        !            26:  */
        !            27: 
        !            28: #include <sys/types.h>
        !            29: #include <stdio.h>
        !            30: #include <syslog.h>
        !            31: #include <arpa/nameser.h>
        !            32: #include "db.h"
        !            33: 
        !            34: #ifdef DEBUG
        !            35: extern int debug;
        !            36: extern FILE *ddt;
        !            37: #endif
        !            38: 
        !            39: extern char *strcpy();
        !            40: 
        !            41: /*
        !            42:  * Allocate a name buffer & save name.
        !            43:  */
        !            44: struct namebuf *
        !            45: savename(name)
        !            46:        char *name;
        !            47: {
        !            48:        register struct namebuf *np;
        !            49: 
        !            50:        np = (struct namebuf *) malloc(sizeof(struct namebuf));
        !            51:        if (np == NULL) {
        !            52:                syslog(LOG_ERR, "savename: %m");
        !            53:                exit(1);
        !            54:        }
        !            55:        np->n_dname = savestr(name);
        !            56:        np->n_next = NULL;
        !            57:        np->n_data = NULL;
        !            58:        np->n_hash = NULL;
        !            59:        return (np);
        !            60: }
        !            61: 
        !            62: /*
        !            63:  * Allocate a data buffer & save data.
        !            64:  */
        !            65: struct databuf *
        !            66: savedata(class, type, ttl, data, size)
        !            67:        int class, type;
        !            68:        u_long ttl;
        !            69:        char *data;
        !            70:        int size;
        !            71: {
        !            72:        register struct databuf *dp;
        !            73: 
        !            74:        if (type == T_NS)
        !            75:                dp = (struct databuf *) 
        !            76:                    malloc((unsigned)DATASIZE(size)+sizeof(u_long));
        !            77:        else
        !            78:                dp = (struct databuf *) malloc((unsigned)DATASIZE(size));
        !            79:        if (dp == NULL) {
        !            80:                syslog(LOG_ERR, "savedata: %m");
        !            81:                exit(1);
        !            82:        }
        !            83:        dp->d_next = NULL;
        !            84:        dp->d_type = type;
        !            85:        dp->d_class = class;
        !            86:        dp->d_ttl = ttl;
        !            87:        dp->d_size = size;
        !            88:        dp->d_mark = 0;
        !            89:        dp->d_flags = 0;
        !            90:        dp->d_nstime = 0;
        !            91:        bcopy(data, dp->d_data, dp->d_size);
        !            92:        return (dp);
        !            93: }
        !            94: 
        !            95: int hashsizes[] = {    /* hashtable sizes */
        !            96:        2,
        !            97:        11,
        !            98:        113,
        !            99:        337,
        !           100:        977,
        !           101:        2053,
        !           102:        4073,
        !           103:        8011,
        !           104:        16001,
        !           105:        0
        !           106: };
        !           107: 
        !           108: /*
        !           109:  * Allocate a data buffer & save data.
        !           110:  */
        !           111: struct hashbuf *
        !           112: savehash(oldhtp)
        !           113:        register struct hashbuf *oldhtp;
        !           114: {
        !           115:        register struct hashbuf *htp;
        !           116:        register struct namebuf *np, *nnp, **hp;
        !           117:        register int n;
        !           118:        int newsize;
        !           119: 
        !           120:        if (oldhtp == NULL)
        !           121:                newsize = hashsizes[0];
        !           122:        else {
        !           123:                for (n = 0; newsize = hashsizes[n++]; )
        !           124:                        if (oldhtp->h_size == newsize) {
        !           125:                                newsize = hashsizes[n];
        !           126:                                break;
        !           127:                        }
        !           128:                if (newsize == 0)
        !           129:                        newsize = oldhtp->h_size * 2 + 1;
        !           130:        }
        !           131: #ifdef DEBUG
        !           132:        if(debug > 3)
        !           133:                fprintf(ddt, "savehash GROWING to %d\n", newsize);
        !           134: #endif
        !           135:        htp = (struct hashbuf *) malloc((unsigned)HASHSIZE(newsize));
        !           136:        if (htp == NULL) {
        !           137:                syslog(LOG_ERR, "savehash: %m");
        !           138:                exit(1);
        !           139:        }
        !           140:        htp->h_size = newsize;
        !           141:        bzero((char *) htp->h_tab, newsize * sizeof(struct hashbuf *));
        !           142:        if (oldhtp == NULL) {
        !           143:                htp->h_cnt = 0;
        !           144:                return (htp);
        !           145:        }
        !           146: #ifdef DEBUG
        !           147:        if (debug > 3)
        !           148:                fprintf(ddt,"savehash(%#x) cnt=%d, sz=%d, newsz=%d\n",
        !           149:                        oldhtp, oldhtp->h_cnt, oldhtp->h_size, newsize);
        !           150: #endif
        !           151:        htp->h_cnt = oldhtp->h_cnt;
        !           152:        for (n = 0; n < oldhtp->h_size; n++) {
        !           153:                for (np = oldhtp->h_tab[n]; np != NULL; np = nnp) {
        !           154:                        nnp = np->n_next;
        !           155:                        hp = &htp->h_tab[np->n_hashval % htp->h_size];
        !           156:                        np->n_next = *hp;
        !           157:                        *hp = np;
        !           158:                }
        !           159:        }
        !           160:        free((char *) oldhtp);
        !           161:        return (htp);
        !           162: }
        !           163: 
        !           164: /*
        !           165:  * Allocate an inverse query buffer.
        !           166:  */
        !           167: struct invbuf *
        !           168: saveinv()
        !           169: {
        !           170:        register struct invbuf *ip;
        !           171: 
        !           172:        ip = (struct invbuf *) malloc(sizeof(struct invbuf));
        !           173:        if (ip == NULL) {
        !           174:                syslog(LOG_ERR, "saveinv: %m");
        !           175:                exit(1);
        !           176:        }
        !           177:        ip->i_next = NULL;
        !           178:        bzero((char *)ip->i_dname, sizeof(ip->i_dname));
        !           179:        return (ip);
        !           180: }
        !           181: 
        !           182: /*
        !           183:  * Make a copy of a string and return a pointer to it.
        !           184:  */
        !           185: char *
        !           186: savestr(str)
        !           187:        char *str;
        !           188: {
        !           189:        char *cp;
        !           190: 
        !           191:        cp = malloc((unsigned)strlen(str) + 1);
        !           192:        if (cp == NULL) {
        !           193:                syslog(LOG_ERR, "savestr: %m");
        !           194:                exit(1);
        !           195:        }
        !           196:        (void) strcpy(cp, str);
        !           197:        return (cp);
        !           198: }

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