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Annotation of 43BSDTahoe/etc/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
        !             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: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)db_save.c  4.14 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: /*
        !            23:  * Buffer allocation and deallocation routines.
        !            24:  */
        !            25: 
        !            26: #include <sys/types.h>
        !            27: #include <stdio.h>
        !            28: #include <syslog.h>
        !            29: #include <arpa/nameser.h>
        !            30: #include "db.h"
        !            31: 
        !            32: #ifdef DEBUG
        !            33: extern int debug;
        !            34: extern FILE *ddt;
        !            35: #endif
        !            36: 
        !            37: extern char *strcpy();
        !            38: 
        !            39: /*
        !            40:  * Allocate a name buffer & save name.
        !            41:  */
        !            42: struct namebuf *
        !            43: savename(name)
        !            44:        char *name;
        !            45: {
        !            46:        register struct namebuf *np;
        !            47: 
        !            48:        np = (struct namebuf *) malloc(sizeof(struct namebuf));
        !            49:        if (np == NULL) {
        !            50:                syslog(LOG_ERR, "savename: %m");
        !            51:                exit(1);
        !            52:        }
        !            53:        np->n_dname = savestr(name);
        !            54:        np->n_next = NULL;
        !            55:        np->n_data = NULL;
        !            56:        np->n_hash = NULL;
        !            57:        return (np);
        !            58: }
        !            59: 
        !            60: /*
        !            61:  * Allocate a data buffer & save data.
        !            62:  */
        !            63: struct databuf *
        !            64: savedata(class, type, ttl, data, size)
        !            65:        int class, type;
        !            66:        u_long ttl;
        !            67:        char *data;
        !            68:        int size;
        !            69: {
        !            70:        register struct databuf *dp;
        !            71: 
        !            72:        if (type == T_NS)
        !            73:                dp = (struct databuf *) 
        !            74:                    malloc((unsigned)DATASIZE(size)+sizeof(u_long));
        !            75:        else
        !            76:                dp = (struct databuf *) malloc((unsigned)DATASIZE(size));
        !            77:        if (dp == NULL) {
        !            78:                syslog(LOG_ERR, "savedata: %m");
        !            79:                exit(1);
        !            80:        }
        !            81:        dp->d_next = NULL;
        !            82:        dp->d_type = type;
        !            83:        dp->d_class = class;
        !            84:        dp->d_ttl = ttl;
        !            85:        dp->d_size = size;
        !            86:        dp->d_mark = 0;
        !            87:        dp->d_flags = 0;
        !            88:        dp->d_nstime = 0;
        !            89:        bcopy(data, dp->d_data, dp->d_size);
        !            90:        return (dp);
        !            91: }
        !            92: 
        !            93: int hashsizes[] = {    /* hashtable sizes */
        !            94:        2,
        !            95:        11,
        !            96:        113,
        !            97:        337,
        !            98:        977,
        !            99:        2053,
        !           100:        4073,
        !           101:        8011,
        !           102:        16001,
        !           103:        0
        !           104: };
        !           105: 
        !           106: /*
        !           107:  * Allocate a data buffer & save data.
        !           108:  */
        !           109: struct hashbuf *
        !           110: savehash(oldhtp)
        !           111:        register struct hashbuf *oldhtp;
        !           112: {
        !           113:        register struct hashbuf *htp;
        !           114:        register struct namebuf *np, *nnp, **hp;
        !           115:        register int n;
        !           116:        int newsize;
        !           117: 
        !           118:        if (oldhtp == NULL)
        !           119:                newsize = hashsizes[0];
        !           120:        else {
        !           121:                for (n = 0; newsize = hashsizes[n++]; )
        !           122:                        if (oldhtp->h_size == newsize) {
        !           123:                                newsize = hashsizes[n];
        !           124:                                break;
        !           125:                        }
        !           126:                if (newsize == 0)
        !           127:                        newsize = oldhtp->h_size * 2 + 1;
        !           128:        }
        !           129: #ifdef DEBUG
        !           130:        if(debug > 3)
        !           131:                fprintf(ddt, "savehash GROWING to %d\n", newsize);
        !           132: #endif
        !           133:        htp = (struct hashbuf *) malloc((unsigned)HASHSIZE(newsize));
        !           134:        if (htp == NULL) {
        !           135:                syslog(LOG_ERR, "savehash: %m");
        !           136:                exit(1);
        !           137:        }
        !           138:        htp->h_size = newsize;
        !           139:        bzero((char *) htp->h_tab, newsize * sizeof(struct hashbuf *));
        !           140:        if (oldhtp == NULL) {
        !           141:                htp->h_cnt = 0;
        !           142:                return (htp);
        !           143:        }
        !           144: #ifdef DEBUG
        !           145:        if (debug > 3)
        !           146:                fprintf(ddt,"savehash(%#x) cnt=%d, sz=%d, newsz=%d\n",
        !           147:                        oldhtp, oldhtp->h_cnt, oldhtp->h_size, newsize);
        !           148: #endif
        !           149:        htp->h_cnt = oldhtp->h_cnt;
        !           150:        for (n = 0; n < oldhtp->h_size; n++) {
        !           151:                for (np = oldhtp->h_tab[n]; np != NULL; np = nnp) {
        !           152:                        nnp = np->n_next;
        !           153:                        hp = &htp->h_tab[np->n_hashval % htp->h_size];
        !           154:                        np->n_next = *hp;
        !           155:                        *hp = np;
        !           156:                }
        !           157:        }
        !           158:        free((char *) oldhtp);
        !           159:        return (htp);
        !           160: }
        !           161: 
        !           162: /*
        !           163:  * Allocate an inverse query buffer.
        !           164:  */
        !           165: struct invbuf *
        !           166: saveinv()
        !           167: {
        !           168:        register struct invbuf *ip;
        !           169: 
        !           170:        ip = (struct invbuf *) malloc(sizeof(struct invbuf));
        !           171:        if (ip == NULL) {
        !           172:                syslog(LOG_ERR, "saveinv: %m");
        !           173:                exit(1);
        !           174:        }
        !           175:        ip->i_next = NULL;
        !           176:        bzero((char *)ip->i_dname, sizeof(ip->i_dname));
        !           177:        return (ip);
        !           178: }
        !           179: 
        !           180: /*
        !           181:  * Make a copy of a string and return a pointer to it.
        !           182:  */
        !           183: char *
        !           184: savestr(str)
        !           185:        char *str;
        !           186: {
        !           187:        char *cp;
        !           188: 
        !           189:        cp = malloc((unsigned)strlen(str) + 1);
        !           190:        if (cp == NULL) {
        !           191:                syslog(LOG_ERR, "savestr: %m");
        !           192:                exit(1);
        !           193:        }
        !           194:        (void) strcpy(cp, str);
        !           195:        return (cp);
        !           196: }

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