/*	$NetBSD: db_save.c,v 1.1.1.1 1998/10/05 18:02:00 tron Exp $	*/

#if !defined(lint) && !defined(SABER)
static char sccsid[] = "@(#)db_save.c	4.16 (Berkeley) 3/21/91";
static char rcsid[] = "Id: db_save.c,v 8.15 1998/01/26 22:40:08 halley Exp";
#endif /* not lint */

/*
 * Copyright (c) 1986
 *    The 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.
 */

/*
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 * 
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies, and that
 * the name of Digital Equipment Corporation not be used in advertising or
 * publicity pertaining to distribution of the document or software without
 * specific, written prior permission.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/*
 * Portions Copyright (c) 1996, 1997 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/*
 * Buffer allocation and deallocation routines.
 */

#include "port_before.h"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <arpa/nameser.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>

#include <isc/eventlib.h>
#include <isc/logging.h>
#include <isc/memcluster.h>

#include "port_after.h"

#include "named.h"

/*
 * Allocate a name buffer & save name.
 */
struct namebuf *
savename(const char *name, int len) {
	struct namebuf *np;

	/*
	 * Note that MAXLABEL * 4 < 256, so a single length byte is enough.
	 * Also, we use MAXLABEL * 4 because each label character can
	 * expand into up to four characters when rendered in canonical
	 * form.
	 */
	INSIST(len >= 0 && len <= (MAXLABEL * 4));
	np = (struct namebuf *) memget(NAMESIZE(len));
	if (np == NULL)
		panic("savename: memget", NULL);
	memset(np, 0, NAMESIZE(len));
	NAMELEN(*np) = (unsigned)len;
	memcpy(NAME(*np), name, len);
	NAME(*np)[len] = '\0';
	return (np);
}

/*
 * Allocate a data buffer & save data.
 */
struct databuf *
savedata(class, type, ttl, data, size)
	int class, type;
	u_int32_t ttl;
	u_char *data;
	int size;
{
	struct databuf *dp;
	int bytes = (type == T_NS) ? DATASIZE(size)+INT32SZ : DATASIZE(size);

	dp = (struct databuf *)memget(bytes);
	if (dp == NULL)
		panic("savedata: memget", NULL);
	memset(dp, 0, bytes);
	dp->d_next = NULL;
	dp->d_type = type;
	dp->d_class = class;
	dp->d_ttl = ttl;
	dp->d_size = size;
	dp->d_mark = 0;
	dp->d_flags = 0;
	dp->d_cred = 0;
	dp->d_clev = 0;
	dp->d_rcode = NOERROR;
	dp->d_ns = NULL;
	dp->d_nstime = 0;
	memcpy(dp->d_data, data, dp->d_size);
	return (dp);
}

int hashsizes[] = {	/* hashtable sizes */
	2,
	11,
	113,
	337,
	977,
	2053,
	4073,
	8011,
	16001,
	99887,
	0
};

/*
 * Allocate a data buffer & save data.
 */
struct hashbuf *
savehash(oldhtp)
	struct hashbuf *oldhtp;
{
	struct hashbuf *htp;
	struct namebuf *np, *nnp, **hp;
	int n, newsize;

	if (oldhtp == NULL)
		newsize = hashsizes[0];
	else {
		for (n = 0; (newsize = hashsizes[n++]) != 0; (void)NULL)
			if (oldhtp->h_size == newsize) {
				newsize = hashsizes[n];
				break;
			}
		if (newsize == 0)
			newsize = oldhtp->h_size * 2 + 1;
	}
	ns_debug(ns_log_db, 4, "savehash GROWING to %d", newsize);
	htp = (struct hashbuf *) memget(HASHSIZE(newsize));
	if (htp == NULL)
		ns_panic(ns_log_db, 0, "savehash: %s", strerror(errno));
	htp->h_size = newsize;
	memset(htp->h_tab, 0, newsize * sizeof(struct namebuf *));
	if (oldhtp == NULL) {
		htp->h_cnt = 0;
		return (htp);
	}
	ns_debug(ns_log_db, 4, "savehash(%#lx) cnt=%d, sz=%d, newsz=%d",
		 (u_long)oldhtp, oldhtp->h_cnt, oldhtp->h_size, newsize);
	htp->h_cnt = oldhtp->h_cnt;
	for (n = 0; n < oldhtp->h_size; n++) {
		for (np = oldhtp->h_tab[n]; np != NULL; np = nnp) {
			nnp = np->n_next;
			hp = &htp->h_tab[np->n_hashval % htp->h_size];
			np->n_next = *hp;
			*hp = np;
		}
	}
	oldhtp->h_cnt = 0;	/* Keep rm_hash() happy. */
	rm_hash(oldhtp);
	return (htp);
}