270 lines
8.0 KiB
C
270 lines
8.0 KiB
C
#if !defined(lint) && !defined(SABER)
|
|
static char sccsid[] = "@(#)db_lookup.c 4.18 (Berkeley) 3/21/91";
|
|
static char rcsid[] = "$Id: db_lookup.c,v 8.13 1998/02/13 19:52:54 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.
|
|
*/
|
|
|
|
/*
|
|
* Table lookup 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 <ctype.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <time.h>
|
|
|
|
#include <isc/eventlib.h>
|
|
#include <isc/logging.h>
|
|
|
|
#include "port_after.h"
|
|
|
|
#include "named.h"
|
|
|
|
/*
|
|
* Lookup 'name' and return a pointer to the namebuf;
|
|
* NULL otherwise. If 'insert', insert name into tables.
|
|
* Wildcard lookups are handled.
|
|
*/
|
|
struct namebuf *
|
|
nlookup(const char *name, struct hashbuf **htpp,
|
|
const char **fname, int insert)
|
|
{
|
|
struct namebuf *np;
|
|
const char *cp;
|
|
int c;
|
|
u_int hval;
|
|
struct hashbuf *htp;
|
|
struct namebuf *parent = NULL;
|
|
int escaped = 0;
|
|
|
|
htp = *htpp;
|
|
hval = 0;
|
|
*fname = "???";
|
|
for (cp = name; (c = *cp++) != 0; (void)NULL) {
|
|
if (!escaped && (c == '.')) {
|
|
parent = np = nlookup(cp, htpp, fname, insert);
|
|
if (np == NULL)
|
|
return (NULL);
|
|
if (*fname != cp)
|
|
return (np);
|
|
if ((htp = np->n_hash) == NULL) {
|
|
if (!insert) {
|
|
if (ns_wildcard(NAME(*np)))
|
|
*fname = name;
|
|
return (np);
|
|
}
|
|
htp = savehash((struct hashbuf *)NULL);
|
|
np->n_hash = htp;
|
|
}
|
|
*htpp = htp;
|
|
break;
|
|
}
|
|
|
|
/* rotate left HASHSHIFT */
|
|
hval = (hval << HASHSHIFT) |
|
|
(hval>>((sizeof(hval)*8)-HASHSHIFT));
|
|
hval += ((isascii(c) && isupper(c)) ? tolower(c) : c)
|
|
& HASHMASK;
|
|
if (escaped)
|
|
escaped = 0;
|
|
else if (c == '\\')
|
|
escaped = 1;
|
|
}
|
|
cp--;
|
|
/*
|
|
* Lookup this label in current hash table.
|
|
*/
|
|
for (np = htp->h_tab[hval % htp->h_size];
|
|
np != NULL;
|
|
np = np->n_next) {
|
|
if (np->n_hashval == hval &&
|
|
((size_t)NAMELEN(*np) == (size_t)(cp - name)) &&
|
|
(strncasecmp(name, NAME(*np), cp - name) == 0)) {
|
|
*fname = name;
|
|
return (np);
|
|
}
|
|
}
|
|
if (!insert) {
|
|
/*
|
|
* Look for wildcard in this hash table.
|
|
* Don't use a cached "*" name as a wildcard,
|
|
* only authoritative.
|
|
*/
|
|
hval = ('*' & HASHMASK) % htp->h_size;
|
|
for (np = htp->h_tab[hval]; np != NULL; np = np->n_next) {
|
|
if (ns_wildcard(NAME(*np)) &&
|
|
np->n_data && np->n_data->d_zone != 0) {
|
|
*fname = name;
|
|
return (np);
|
|
}
|
|
}
|
|
return (parent);
|
|
}
|
|
np = savename(name, cp - name);
|
|
np->n_parent = parent;
|
|
np->n_hashval = hval;
|
|
hval %= htp->h_size;
|
|
np->n_next = htp->h_tab[hval];
|
|
htp->h_tab[hval] = np;
|
|
/* Increase hash table size. */
|
|
if (++htp->h_cnt > htp->h_size * 2) {
|
|
*htpp = savehash(htp);
|
|
if (parent == NULL) {
|
|
if (htp == hashtab) {
|
|
hashtab = *htpp;
|
|
} else {
|
|
fcachetab = *htpp;
|
|
}
|
|
}
|
|
else
|
|
parent->n_hash = *htpp;
|
|
htp = *htpp;
|
|
}
|
|
*fname = name;
|
|
return (np);
|
|
}
|
|
|
|
/* struct namebuf *
|
|
* np_parent(struct namebuf *np)
|
|
* Find the "parent" namebuf of np.
|
|
* This is tricky since the parent of "com" is "" and both are stored
|
|
* in the same hashbuf.
|
|
* See also:
|
|
* the AXFR wart description in ns_req.c
|
|
*/
|
|
struct namebuf *
|
|
np_parent(np)
|
|
struct namebuf *np;
|
|
{
|
|
struct hashbuf *htp;
|
|
struct namebuf *np2;
|
|
|
|
if (np->n_parent != NULL || NAME(*np)[0] == '\0')
|
|
return (np->n_parent);
|
|
|
|
/* Try to figure out if np is pointing into the cache or hints. */
|
|
/* Try the cache first. */
|
|
htp = hashtab;
|
|
try_again:
|
|
/* Search the hash chain that np should be part of. */
|
|
for (np2 = htp->h_tab[np->n_hashval % htp->h_size];
|
|
np2 != NULL;
|
|
np2 = np2->n_next) {
|
|
|
|
if (np == np2) { /* found it! */
|
|
/* "" hashes into the first bucket */
|
|
for (np = htp->h_tab[0]; np ; np=np->n_next) {
|
|
if (NAME(*np)[0] == '\0')
|
|
/* found the root namebuf */
|
|
return (np);
|
|
}
|
|
ns_debug(ns_log_db, 1,
|
|
"np_parent(0x%lx) couldn't find root entry",
|
|
(u_long) np);
|
|
return (NULL); /* XXX shouldn't happen */
|
|
}
|
|
}
|
|
/* Try the hints. */
|
|
if (htp == hashtab) {
|
|
htp = fcachetab;
|
|
goto try_again;
|
|
}
|
|
ns_debug(ns_log_db, 1, "np_parent(0x%lx) couldn't namebuf",
|
|
(u_long)np);
|
|
return (NULL); /* XXX shouldn't happen */
|
|
}
|
|
|
|
/* int
|
|
* match(dp, class, type)
|
|
* Does data record `dp' match the class and type?
|
|
* return value:
|
|
* boolean
|
|
*/
|
|
int
|
|
match(struct databuf *dp, int class, int type) {
|
|
if (dp->d_class != class && class != C_ANY)
|
|
return (0);
|
|
if (dp->d_type != type && type != T_ANY)
|
|
return (0);
|
|
return (1);
|
|
}
|