270 lines
8.0 KiB
C
270 lines
8.0 KiB
C
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#if !defined(lint) && !defined(SABER)
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static char sccsid[] = "@(#)db_lookup.c 4.18 (Berkeley) 3/21/91";
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static char rcsid[] = "$Id: db_lookup.c,v 8.13 1998/02/13 19:52:54 halley Exp $";
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#endif /* not lint */
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/*
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* Copyright (c) 1986
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Portions Copyright (c) 1996, 1997 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Table lookup routines.
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*/
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <isc/eventlib.h>
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#include <isc/logging.h>
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#include "port_after.h"
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#include "named.h"
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/*
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* Lookup 'name' and return a pointer to the namebuf;
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* NULL otherwise. If 'insert', insert name into tables.
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* Wildcard lookups are handled.
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*/
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struct namebuf *
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nlookup(const char *name, struct hashbuf **htpp,
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const char **fname, int insert)
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{
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struct namebuf *np;
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const char *cp;
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int c;
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u_int hval;
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struct hashbuf *htp;
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struct namebuf *parent = NULL;
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int escaped = 0;
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htp = *htpp;
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hval = 0;
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*fname = "???";
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for (cp = name; (c = *cp++) != 0; (void)NULL) {
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if (!escaped && (c == '.')) {
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parent = np = nlookup(cp, htpp, fname, insert);
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if (np == NULL)
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return (NULL);
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if (*fname != cp)
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return (np);
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if ((htp = np->n_hash) == NULL) {
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if (!insert) {
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if (ns_wildcard(NAME(*np)))
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*fname = name;
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return (np);
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}
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htp = savehash((struct hashbuf *)NULL);
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np->n_hash = htp;
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}
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*htpp = htp;
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break;
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}
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/* rotate left HASHSHIFT */
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hval = (hval << HASHSHIFT) |
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(hval>>((sizeof(hval)*8)-HASHSHIFT));
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hval += ((isascii(c) && isupper(c)) ? tolower(c) : c)
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& HASHMASK;
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if (escaped)
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escaped = 0;
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else if (c == '\\')
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escaped = 1;
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}
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cp--;
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/*
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* Lookup this label in current hash table.
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*/
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for (np = htp->h_tab[hval % htp->h_size];
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np != NULL;
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np = np->n_next) {
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if (np->n_hashval == hval &&
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((size_t)NAMELEN(*np) == (size_t)(cp - name)) &&
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(strncasecmp(name, NAME(*np), cp - name) == 0)) {
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*fname = name;
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return (np);
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}
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}
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if (!insert) {
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/*
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* Look for wildcard in this hash table.
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* Don't use a cached "*" name as a wildcard,
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* only authoritative.
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*/
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hval = ('*' & HASHMASK) % htp->h_size;
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for (np = htp->h_tab[hval]; np != NULL; np = np->n_next) {
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if (ns_wildcard(NAME(*np)) &&
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np->n_data && np->n_data->d_zone != 0) {
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*fname = name;
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return (np);
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}
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}
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return (parent);
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}
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np = savename(name, cp - name);
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np->n_parent = parent;
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np->n_hashval = hval;
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hval %= htp->h_size;
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np->n_next = htp->h_tab[hval];
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htp->h_tab[hval] = np;
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/* Increase hash table size. */
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if (++htp->h_cnt > htp->h_size * 2) {
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*htpp = savehash(htp);
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if (parent == NULL) {
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if (htp == hashtab) {
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hashtab = *htpp;
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} else {
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fcachetab = *htpp;
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}
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}
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else
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parent->n_hash = *htpp;
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htp = *htpp;
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}
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*fname = name;
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return (np);
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}
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/* struct namebuf *
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* np_parent(struct namebuf *np)
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* Find the "parent" namebuf of np.
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* This is tricky since the parent of "com" is "" and both are stored
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* in the same hashbuf.
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* See also:
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* the AXFR wart description in ns_req.c
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*/
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struct namebuf *
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np_parent(np)
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struct namebuf *np;
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{
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struct hashbuf *htp;
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struct namebuf *np2;
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if (np->n_parent != NULL || NAME(*np)[0] == '\0')
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return (np->n_parent);
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/* Try to figure out if np is pointing into the cache or hints. */
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/* Try the cache first. */
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htp = hashtab;
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try_again:
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/* Search the hash chain that np should be part of. */
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for (np2 = htp->h_tab[np->n_hashval % htp->h_size];
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np2 != NULL;
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np2 = np2->n_next) {
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if (np == np2) { /* found it! */
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/* "" hashes into the first bucket */
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for (np = htp->h_tab[0]; np ; np=np->n_next) {
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if (NAME(*np)[0] == '\0')
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/* found the root namebuf */
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return (np);
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}
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ns_debug(ns_log_db, 1,
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"np_parent(0x%lx) couldn't find root entry",
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(u_long) np);
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return (NULL); /* XXX shouldn't happen */
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}
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}
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/* Try the hints. */
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if (htp == hashtab) {
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htp = fcachetab;
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goto try_again;
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}
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ns_debug(ns_log_db, 1, "np_parent(0x%lx) couldn't namebuf",
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(u_long)np);
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return (NULL); /* XXX shouldn't happen */
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}
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/* int
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* match(dp, class, type)
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* Does data record `dp' match the class and type?
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* return value:
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* boolean
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*/
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int
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match(struct databuf *dp, int class, int type) {
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if (dp->d_class != class && class != C_ANY)
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return (0);
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if (dp->d_type != type && type != T_ANY)
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return (0);
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return (1);
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}
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