933 lines
27 KiB
C
933 lines
27 KiB
C
#if !defined(lint) && !defined(SABER)
|
|
static char sccsid[] = "@(#)db_update.c 4.28 (Berkeley) 3/21/91";
|
|
static char rcsid[] = "$Id: db_update.c,v 8.23 1998/02/13 20:01:38 halley Exp $";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* Copyright (c) 1986, 1990
|
|
* 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.
|
|
*/
|
|
|
|
#include "port_before.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <arpa/nameser.h>
|
|
|
|
#include <resolv.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"
|
|
|
|
/* int
|
|
* isRefByNS(name, htp)
|
|
* recurse through all of `htp' looking for NS RR's that refer to `name'.
|
|
* returns:
|
|
* nonzero if at least one such NS RR exists
|
|
* cautions:
|
|
* this is very expensive; probably you only want to use on fcachetab.
|
|
*/
|
|
static int
|
|
isRefByNS(const char *name, struct hashbuf *htp) {
|
|
struct namebuf *np;
|
|
struct databuf *dp;
|
|
|
|
for (np = htp->h_tab[0]; np != NULL; np = np->n_next) {
|
|
for (dp = np->n_data; dp != NULL; dp = dp->d_next) {
|
|
if ((dp->d_class == C_ANY ||
|
|
dp->d_class == C_IN ||
|
|
dp->d_class == C_HS) &&
|
|
dp->d_type == T_NS &&
|
|
!dp->d_rcode &&
|
|
!strcasecmp(name, (char *)dp->d_data)) {
|
|
return (1);
|
|
}
|
|
}
|
|
if (np->n_hash && isRefByNS(name, np->n_hash))
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
/* int
|
|
* findMyZone(struct namebuf *np, int class)
|
|
* surf the zone cuts and find this zone the hard way
|
|
* return value:
|
|
* zone number or DB_Z_CACHE if it's outside a zone
|
|
* interesting cases:
|
|
* DEC.COM SOA (primary)
|
|
* CRL.DEC.COM NS (in primary)
|
|
* if you start at CRL.. here, you find the DEC.COM zone
|
|
* if you start at NS.CRL.. here, you're in the cache
|
|
* DEC.COM SOA (primary)
|
|
* CRL.DEC.COM NS (in primary)
|
|
* CRL.DEC.COM SOA (secondary)
|
|
* CRL.DEC.COM NS (in secondary)
|
|
* if you start at CRL.. here, you find the CRL.DEC.COM zone
|
|
* if you start at NS.CRL.. here, you're in the CRL.. zone
|
|
*/
|
|
int
|
|
findMyZone(struct namebuf *np, int class) {
|
|
for ((void)NULL; np; np = np_parent(np)) {
|
|
struct databuf *dp;
|
|
|
|
/* if we encounter an SOA, we're in its zone (which can be
|
|
* the cache or an authoritative zone, depending).
|
|
*/
|
|
for (dp = np->n_data; dp; dp = dp->d_next)
|
|
if (match(dp, class, T_SOA))
|
|
return (dp->d_zone);
|
|
|
|
/* if we find an NS at some node without having seen an SOA
|
|
* (above), then we're out in the cache somewhere.
|
|
*/
|
|
for (dp = np->n_data; dp; dp = dp->d_next)
|
|
if (match(dp, class, T_NS))
|
|
return (DB_Z_CACHE);
|
|
}
|
|
|
|
/* getting all the way to the root without finding an NS or SOA
|
|
* probably means that we are in deep dip, but we'll treat it as
|
|
* being in the cache. (XXX?)
|
|
*/
|
|
return (DB_Z_CACHE);
|
|
}
|
|
|
|
|
|
#define ISVALIDGLUE(xdp) ((xdp)->d_type == T_NS || (xdp)->d_type == T_A \
|
|
|| (xdp)->d_type == T_AAAA)
|
|
|
|
/* int
|
|
* db_update(name, odp, newdp, savedpp, flags, htp, from)
|
|
* update data base node at `name'. `flags' controls the action.
|
|
* side effects:
|
|
* inverse query tables modified, if we're using them.
|
|
* return value:
|
|
* OK - success
|
|
* NONAME - name doesn't exist
|
|
* AUTH - you can't do that
|
|
* DATAEXISTS - there's something there and DB_NODATA was specified
|
|
* NODATA - there's no data, and (DB_DELETE or DB_MEXIST) was spec'd
|
|
*
|
|
* Policy: How to add data if one more RR is -ve data
|
|
*
|
|
* NEND NOERROR_NODATA
|
|
* NXD NXDOMAIN
|
|
*
|
|
* match
|
|
* old
|
|
* Data NEND NXD
|
|
* Data Merge Data Data
|
|
* new NEND NEND NEND NEND
|
|
* NXD NXD NXD NXD
|
|
*
|
|
* no match
|
|
* old
|
|
* Data NEND NXD
|
|
* Data Merge Merge Data
|
|
* new NEND Merge Merge NEND
|
|
* NXD NXD NXD NXD
|
|
*
|
|
*/
|
|
/* XXX: this code calls nlookup, which can create namebuf's. if this code
|
|
* has to exit with a fatal error, it should scan from the new np upward
|
|
* and for each node which has no children and no data it should remove
|
|
* the namebuf. design notes: (1) there's no harm in doing this even if
|
|
* success occurred; (2) stopping on the first nonremovable np is optimal;
|
|
* the code for removal should be taken out of clean_cache() and made
|
|
* general enough for this use, and for clean_cache()'s continued use.
|
|
* vix, 21jul94
|
|
*/
|
|
int
|
|
db_update(const char *name,
|
|
struct databuf *odp, struct databuf *newdp,
|
|
struct databuf **savedpp,
|
|
int flags, struct hashbuf *htp, struct sockaddr_in from)
|
|
{
|
|
struct databuf *dp, *pdp;
|
|
struct namebuf *np;
|
|
int zn, isHintNS;
|
|
int check_ttl = 0;
|
|
const char *fname;
|
|
#ifdef BIND_UPDATE
|
|
int i, found_other_ns = 0;
|
|
struct databuf *tmpdp;
|
|
u_char *cp1, *cp2;
|
|
u_int32_t dp_serial, newdp_serial;
|
|
#endif
|
|
|
|
ns_debug(ns_log_db, 3, "db_update(%s, %#x, %#x, %#x, 0%o, %#x)%s",
|
|
name, odp, newdp, savedpp, flags, htp,
|
|
(odp && (odp->d_flags&DB_F_HINT)) ? " hint" : "");
|
|
np = nlookup(name, &htp, &fname, newdp != NULL);
|
|
if (np == NULL || fname != name)
|
|
return (NONAME);
|
|
|
|
if (newdp && zones[newdp->d_zone].z_type == Z_PRIMARY)
|
|
check_ttl = 1;
|
|
|
|
/* don't let nonauthoritative updates write in authority zones */
|
|
if (newdp && ((zn = findMyZone(np, newdp->d_class)) != DB_Z_CACHE) &&
|
|
#ifdef STUBS
|
|
(zones[zn].z_type != Z_STUB) &&
|
|
#endif
|
|
(flags & DB_NOTAUTH)) {
|
|
int foundRR = 0;
|
|
|
|
/*
|
|
* Don't generate the warning if the update
|
|
* would have been harmless (identical data).
|
|
*/
|
|
for (dp = np->n_data; dp != NULL; dp = dp->d_next) {
|
|
if (!db_cmp(dp, newdp)) {
|
|
foundRR++;
|
|
break;
|
|
}
|
|
}
|
|
if (!foundRR)
|
|
ns_debug(ns_log_db, 5,
|
|
"[%s].%d update? to auth zone \"%s\" (%s)",
|
|
inet_ntoa(from.sin_addr),
|
|
ntohs(from.sin_port),
|
|
zones[zn].z_origin,
|
|
name);
|
|
return (AUTH);
|
|
}
|
|
|
|
if (newdp && zn && !(flags & DB_NOTAUTH)) {
|
|
if (nlabels(zones[zn].z_origin) > newdp->d_clev) {
|
|
ns_debug(ns_log_db, 5,
|
|
"attempted update child zone %s, %s",
|
|
zones[zn].z_origin, name);
|
|
return (AUTH);
|
|
}
|
|
}
|
|
|
|
/* some special checks for root NS' A RR's */
|
|
isHintNS = isRefByNS(name, fcachetab);
|
|
#ifdef DEPRECATED
|
|
if (newdp && isHintNS && newdp->d_type == T_A) {
|
|
/* upgrade credibility of additional data for rootsrv addrs */
|
|
if (newdp->d_cred == DB_C_ADDITIONAL) {
|
|
ns_debug(ns_log_db, 3,
|
|
"upgrading credibility for A RR (%s)",
|
|
name);
|
|
/* XXX: should copy NS RR's, but we really just want
|
|
* to prevent deprecation later so this will do.
|
|
*/
|
|
newdp->d_cred = DB_C_ANSWER;
|
|
newdp->d_clev = 0;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Reflect certain updates in hint cache also... */
|
|
/* Don't stick data we are authoritative for in hints. */
|
|
if (!(flags & DB_NOHINTS) &&
|
|
(flags & DB_PRIMING) &&
|
|
(odp != NULL) &&
|
|
(htp != fcachetab) &&
|
|
(DB_Z_SPECIAL(odp->d_zone)) &&
|
|
!(odp->d_flags & DB_F_HINT) &&
|
|
(!newdp || !newdp->d_rcode) &&
|
|
((name[0] == '\0' && odp->d_type == T_NS) ||
|
|
(odp->d_type == T_A && isHintNS)
|
|
)
|
|
)
|
|
{
|
|
ns_debug(ns_log_db, 3, "db_update: hint '%s' %u",
|
|
name, odp->d_ttl);
|
|
dp = savedata(odp->d_class, odp->d_type, odp->d_ttl,
|
|
odp->d_data, odp->d_size);
|
|
dp->d_zone = DB_Z_CACHE;
|
|
dp->d_flags = DB_F_HINT;
|
|
dp->d_cred = DB_C_CACHE;
|
|
dp->d_clev = 0;
|
|
if (db_update(name,
|
|
dp, dp, NULL,
|
|
(flags|DB_NOHINTS),
|
|
fcachetab, from)
|
|
!= OK) {
|
|
ns_debug(ns_log_db, 3,
|
|
"db_update: hint %#x freed", dp);
|
|
db_freedata(dp);
|
|
}
|
|
}
|
|
|
|
if (odp != NULL) {
|
|
int foundRR = 0;
|
|
|
|
pdp = NULL;
|
|
for (dp = np->n_data; dp != NULL; ) {
|
|
if (!match(dp, odp->d_class, odp->d_type)) {
|
|
/* {class,type} doesn't match. these are
|
|
* the aggregation cases.
|
|
*/
|
|
/* Check that CNAMEs are only accompanied by
|
|
* Secure DNS RR's (KEY, SIG, and NXT).
|
|
*/
|
|
if (((dp->d_type == T_CNAME &&
|
|
odp->d_type != T_KEY &&
|
|
odp->d_type != T_SIG &&
|
|
odp->d_type != T_NXT) ||
|
|
(odp->d_type == T_CNAME &&
|
|
dp->d_type != T_KEY &&
|
|
dp->d_type != T_SIG &&
|
|
dp->d_type != T_NXT)) &&
|
|
odp->d_class == dp->d_class &&
|
|
/* XXXRTH d_mark removed in 4.9.5,
|
|
but still here for dynamic
|
|
update */
|
|
odp->d_mark == dp->d_mark &&
|
|
!dp->d_rcode &&
|
|
!odp->d_rcode &&
|
|
#ifdef BIND_UPDATE
|
|
/* updating a CNAME with another CNAME is permitted */
|
|
(dp->d_type != T_CNAME ||
|
|
odp->d_type != T_CNAME) &&
|
|
#endif
|
|
zones[odp->d_zone].z_type != Z_CACHE) {
|
|
ns_info(ns_log_db,
|
|
"%s has CNAME and other data (invalid)",
|
|
name);
|
|
goto skip;
|
|
}
|
|
if (!newdp || newdp->d_class != dp->d_class)
|
|
goto skip;
|
|
|
|
/* if the new data is authorative
|
|
* remove any data for this domain with
|
|
* the same class that isn't as credable
|
|
*/
|
|
if (newdp->d_cred == DB_C_ZONE &&
|
|
newdp->d_cred > dp->d_cred)
|
|
/* better credibility and the old datum
|
|
* was not from a zone file. remove
|
|
* the old datum.
|
|
*/
|
|
goto delete;
|
|
|
|
#if 0 /* caught by findMyZone() now. */
|
|
/* if we have authoritative data for a
|
|
* node, don't add in other data.
|
|
*/
|
|
if (dp->d_cred == DB_C_ZONE &&
|
|
newdp->d_cred < dp->d_cred)
|
|
return (AUTH);
|
|
#endif
|
|
|
|
/* if the new data is authoritative but
|
|
* but isn't as credible, reject it.
|
|
*/
|
|
if (newdp->d_cred == DB_C_ZONE &&
|
|
dp->d_cred == DB_C_ZONE) {
|
|
/* Both records are from a zone file.
|
|
* If their credibility levels differ,
|
|
* we're dealing with a zone cut. The
|
|
* record with lower clev is from the
|
|
* upper zone's file and is therefore
|
|
* glue.
|
|
*/
|
|
if (newdp->d_clev < dp->d_clev) {
|
|
if (!ISVALIDGLUE(newdp)) {
|
|
ns_info(ns_log_db,
|
|
"domain %s %s record in zone %s should be in zone %s, ignored",
|
|
name, p_type(newdp->d_type),
|
|
zones[newdp->d_zone].z_origin,
|
|
zones[dp->d_zone].z_origin);
|
|
}
|
|
return (AUTH);
|
|
}
|
|
if (newdp->d_clev > dp->d_clev) {
|
|
if (!ISVALIDGLUE(dp)) {
|
|
ns_info(ns_log_db,
|
|
"domain %s %s record in zone %s should be in zone %s, deleted",
|
|
name, p_type(dp->d_type),
|
|
zones[dp->d_zone].z_origin,
|
|
zones[newdp->d_zone].z_origin);
|
|
}
|
|
goto delete;
|
|
}
|
|
}
|
|
|
|
/* process NXDOMAIN */
|
|
/* policy */
|
|
if (newdp->d_rcode == NXDOMAIN) {
|
|
if (dp->d_cred < DB_C_AUTH)
|
|
goto delete;
|
|
else
|
|
return (DATAEXISTS);
|
|
}
|
|
|
|
if (dp->d_rcode == NXDOMAIN)
|
|
goto delete;
|
|
|
|
/* process NOERROR_NODATA */
|
|
/* NO PROCESSING REQUIRED */
|
|
|
|
goto skip;
|
|
} /*if {class,type} did not match*/
|
|
|
|
/*
|
|
* {type,class} did match. This is the replace case.
|
|
*/
|
|
ns_debug(ns_log_db, 5,
|
|
"db_update: flags = %#x, sizes = %d, %d (cmp %d)",
|
|
flags, odp->d_size, dp->d_size,
|
|
db_cmp(dp, odp));
|
|
if (newdp) {
|
|
ns_debug(ns_log_db, 4,
|
|
"credibility for %s is %d(%d) from [%s].%d, is %d(%d) in cache",
|
|
*name ? name : ".",
|
|
newdp->d_cred,
|
|
newdp->d_clev,
|
|
inet_ntoa(from.sin_addr),
|
|
ntohs(from.sin_port),
|
|
dp->d_cred,
|
|
dp->d_clev);
|
|
if (newdp->d_cred > dp->d_cred) {
|
|
/* better credibility.
|
|
* remove the old datum.
|
|
*/
|
|
goto delete;
|
|
}
|
|
if (newdp->d_cred < dp->d_cred) {
|
|
/* credibility is worse. ignore it. */
|
|
return (AUTH);
|
|
}
|
|
if (newdp->d_cred == DB_C_ZONE &&
|
|
dp->d_cred == DB_C_ZONE ) {
|
|
/* Both records are from a zone file.
|
|
* If their credibility levels differ,
|
|
* we're dealing with a zone cut. The
|
|
* record with lower clev is from the
|
|
* upper zone's file and is therefore
|
|
* glue.
|
|
*/
|
|
|
|
/* XXX - Tricky situation here is you
|
|
* have 2 zones a.b.c and sub.a.b.c
|
|
* being served by the same server.
|
|
* named will send NS records for
|
|
* sub.a.b.c during zone transfer of
|
|
* a.b.c zone. If we're secondary for
|
|
* both zones, and we reload zone
|
|
* a.b.c, we'll get the NS records
|
|
* (and possibly A records to go with
|
|
* them?) for sub.a.b.c as part of the
|
|
* a.b.c zone transfer. But we've
|
|
* already got a more credible record
|
|
* from the sub.a.b.c zone. So we want
|
|
* to ignore the new record, but we
|
|
* shouldn't syslog because there's
|
|
* nothing the user can do to prevent
|
|
* the situation. Perhaps we should
|
|
* only complain when we are primary?
|
|
*/
|
|
|
|
if (newdp->d_clev < dp->d_clev) {
|
|
if (!ISVALIDGLUE(newdp)) {
|
|
ns_info(ns_log_db,
|
|
"domain %s %s record in zone %s should be in zone %s, ignored",
|
|
name, p_type(newdp->d_type),
|
|
zones[newdp->d_zone].z_origin,
|
|
zones[dp->d_zone].z_origin);
|
|
}
|
|
return (AUTH);
|
|
}
|
|
if (newdp->d_clev > dp->d_clev) {
|
|
if (!ISVALIDGLUE(dp)) {
|
|
ns_info(ns_log_db,
|
|
"domain %s %s record in zone %s should be in zone %s, deleted",
|
|
name, p_type(dp->d_type),
|
|
zones[dp->d_zone].z_origin,
|
|
zones[newdp->d_zone].z_origin);
|
|
}
|
|
goto delete;
|
|
}
|
|
}
|
|
|
|
/* credibility is the same.
|
|
* let it aggregate in the normal way.
|
|
*/
|
|
|
|
/*
|
|
* if the new or old RR is -ve, delete old.
|
|
*/
|
|
if (dp->d_rcode || newdp->d_rcode) {
|
|
/* XXX: how can a zone rr be neg? */
|
|
if (dp->d_cred != DB_C_ZONE)
|
|
goto delete;
|
|
else
|
|
return (DATAEXISTS);
|
|
}
|
|
|
|
/*
|
|
* Some RR types should not be aggregated.
|
|
*/
|
|
if (dp->d_type == T_SOA) {
|
|
#ifdef BIND_UPDATE
|
|
u_int32_t dp_ser, ndp_ser;
|
|
u_char *dp_cp, *ndp_cp;
|
|
|
|
dp_cp = findsoaserial(dp->d_data);
|
|
ndp_cp = findsoaserial(newdp->d_data);
|
|
GETLONG(dp_ser, dp_cp);
|
|
GETLONG(ndp_ser, ndp_cp);
|
|
|
|
if (SEQ_GT(ndp_ser, dp_ser))
|
|
goto delete;
|
|
else
|
|
return (SERIAL);
|
|
#else
|
|
goto delete;
|
|
#endif /*BIND_UPDATE*/
|
|
}
|
|
if (dp->d_type == T_WKS &&
|
|
!memcmp(dp->d_data, newdp->d_data,
|
|
INT32SZ + sizeof(u_char)))
|
|
goto delete;
|
|
if (dp->d_type == T_CNAME &&
|
|
!NS_OPTION_P(OPTION_MULTIPLE_CNAMES))
|
|
goto delete;
|
|
#ifdef BIND_UPDATE
|
|
if (dp->d_type == T_SIG)
|
|
/*
|
|
* Type covered has already been
|
|
* checked.
|
|
*/
|
|
goto delete;
|
|
#endif
|
|
if (check_ttl) {
|
|
if (newdp->d_ttl != dp->d_ttl)
|
|
ns_warning(ns_log_db,
|
|
"%s %s %s differing ttls: corrected",
|
|
name[0]?name:".",
|
|
p_class(dp->d_class),
|
|
p_type(dp->d_type));
|
|
if (newdp->d_ttl > dp->d_ttl) {
|
|
newdp->d_ttl = dp->d_ttl;
|
|
} else {
|
|
dp->d_ttl = newdp->d_ttl;
|
|
}
|
|
}
|
|
}
|
|
if ((flags & DB_NODATA) && !db_cmp(dp, odp)) {
|
|
/* Refresh ttl if cache entry. */
|
|
if (dp->d_zone == DB_Z_CACHE) {
|
|
if (odp->d_zone != DB_Z_CACHE) {
|
|
/* Changing cache->auth. */
|
|
dp->d_zone = odp->d_zone;
|
|
dp->d_ttl = odp->d_ttl;
|
|
ns_debug(ns_log_db, 4,
|
|
"db_update: cache entry now in auth zone");
|
|
return (DATAEXISTS);
|
|
}
|
|
fixttl(odp);
|
|
if (odp->d_ttl > dp->d_ttl)
|
|
dp->d_ttl = odp->d_ttl;
|
|
ns_debug(ns_log_db, 3,
|
|
"db_update: new ttl %u +%lu",
|
|
dp->d_ttl,
|
|
(u_long)(dp->d_ttl - tt.tv_sec)
|
|
);
|
|
}
|
|
return (DATAEXISTS);
|
|
}
|
|
/*
|
|
* If the old databuf has some data, check that the
|
|
* data matches that in the new databuf.
|
|
*/
|
|
if (odp->d_size > 0)
|
|
if (db_cmp(dp, odp))
|
|
goto skip;
|
|
if (odp->d_clev < dp->d_clev)
|
|
goto skip;
|
|
if (odp->d_cred < dp->d_cred)
|
|
goto skip;
|
|
#ifdef BIND_UPDATE
|
|
if (!strcasecmp(name, zones[dp->d_zone].z_origin) &&
|
|
!newdp) {
|
|
/* do not delete SOA or NS records as a set */
|
|
/* XXXRTH isn't testing d_size unnecessary? */
|
|
if ((odp->d_size == 0) &&
|
|
(odp->d_class == C_ANY) &&
|
|
(odp->d_type == T_ANY ||
|
|
odp->d_type == T_SOA ||
|
|
odp->d_type == T_NS) &&
|
|
(dp->d_type == T_SOA ||
|
|
dp->d_type == T_NS))
|
|
goto skip;
|
|
/* XXXRTH I added this to prevent SOA deletion
|
|
I'm using the same style of comparison as
|
|
the other code in this section. Do we
|
|
really need to look at dp->d_type here?
|
|
We're in the "match" section... */
|
|
if ((odp->d_type == T_SOA) &&
|
|
(dp->d_type == T_SOA))
|
|
goto skip;
|
|
/* do not delete the last NS record
|
|
for the zone */
|
|
if ((odp->d_type == T_NS) &&
|
|
(dp->d_type == T_NS)) {
|
|
found_other_ns = 0;
|
|
for (tmpdp = np->n_data;
|
|
tmpdp && !found_other_ns;
|
|
tmpdp = tmpdp->d_next)
|
|
if ((tmpdp->d_type == T_NS) &&
|
|
(tmpdp != dp))
|
|
found_other_ns = 1;
|
|
if (!found_other_ns) {
|
|
ns_debug(ns_log_db, 3,
|
|
"cannot delete last remaining NS record for zone %s",
|
|
name);
|
|
goto skip;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
foundRR = 1;
|
|
if (flags & DB_DELETE) {
|
|
delete:
|
|
#ifdef BIND_UPDATE
|
|
/*
|
|
* XXX assume here that savedpp!=NULL iff. db_update
|
|
* has been called by the dyanmic update code.
|
|
* Maybe a new flag is more appropriate?
|
|
*/
|
|
if (savedpp != NULL)
|
|
foundRR = 1;
|
|
#endif
|
|
dp = rm_datum(dp, np, pdp, savedpp);
|
|
} else {
|
|
skip: pdp = dp;
|
|
dp = dp->d_next;
|
|
}
|
|
}
|
|
if (!foundRR) {
|
|
if (flags & DB_DELETE)
|
|
return (NODATA);
|
|
if (flags & DB_MEXIST)
|
|
return (NODATA);
|
|
}
|
|
}
|
|
/* XXX: delete a terminal namebuf also if all databuf's
|
|
* underneath of it have been deleted) */
|
|
if (newdp == NULL)
|
|
return (OK);
|
|
/* XXX: empty nodes bypass credibility checks above; should check
|
|
* response source address here if flags&NOTAUTH.
|
|
*/
|
|
fixttl(newdp);
|
|
ns_debug(ns_log_db, 3, "db_update: adding%s %#x",
|
|
(newdp->d_flags&DB_F_HINT) ? " hint":"", newdp);
|
|
|
|
if (NS_OPTION_P(OPTION_HOSTSTATS) &&
|
|
newdp->d_zone == DB_Z_CACHE &&
|
|
(newdp->d_flags & DB_F_HINT) == 0)
|
|
newdp->d_ns = nameserFind(from.sin_addr, NS_F_INSERT);
|
|
|
|
/* Add to end of list, generally preserving order */
|
|
newdp->d_next = NULL;
|
|
if ((dp = np->n_data) == NULL) {
|
|
DRCNTINC(newdp);
|
|
if (newdp->d_flags & DB_F_ACTIVE)
|
|
panic("db_update: DB_F_ACTIVE set", NULL);
|
|
newdp->d_flags |= DB_F_ACTIVE;
|
|
np->n_data = newdp;
|
|
return (OK);
|
|
}
|
|
while (dp->d_next != NULL) {
|
|
if ((flags & DB_NODATA) && !db_cmp(dp, newdp))
|
|
return (DATAEXISTS);
|
|
dp = dp->d_next;
|
|
}
|
|
if ((flags & DB_NODATA) && !db_cmp(dp, newdp))
|
|
return (DATAEXISTS);
|
|
DRCNTINC(newdp);
|
|
if (newdp->d_flags & DB_F_ACTIVE)
|
|
panic("db_update: DB_F_ACTIVE set", NULL);
|
|
newdp->d_flags |= DB_F_ACTIVE;
|
|
dp->d_next = newdp;
|
|
return (OK);
|
|
}
|
|
|
|
void
|
|
fixttl(struct databuf *dp) {
|
|
if (dp->d_zone == DB_Z_CACHE && (dp->d_flags & DB_F_HINT) == 0) {
|
|
if (dp->d_ttl <= (u_int32_t)tt.tv_sec)
|
|
return;
|
|
else if (dp->d_ttl < (u_int32_t)tt.tv_sec+min_cache_ttl)
|
|
dp->d_ttl = (u_int32_t)tt.tv_sec+min_cache_ttl;
|
|
else if (dp->d_ttl > (u_int32_t)tt.tv_sec+max_cache_ttl)
|
|
dp->d_ttl = (u_int32_t)tt.tv_sec+max_cache_ttl;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Compare type, class and data from databufs for equivalence.
|
|
* All domain names in RR's must be compared case-insensitively.
|
|
* Return 0 if equivalent, nonzero otherwise.
|
|
*/
|
|
int
|
|
db_cmp(const struct databuf *dp1, const struct databuf *dp2) {
|
|
const u_char *cp1, *cp2;
|
|
int len, len2;
|
|
|
|
/* XXXDYNUP- should be changed to
|
|
if (!match(dp1, dp2->d_type, dp2->d_class) */
|
|
if (dp1->d_type != dp2->d_type || dp1->d_class != dp2->d_class)
|
|
return (1);
|
|
/* XXXDYNUP - should be changed to (dp1->d_size != dp2->d_size &&
|
|
dp1->d_size != 0 && dp2->d_size != 0) */
|
|
if (dp1->d_size != dp2->d_size)
|
|
return (1);
|
|
/* d_mark is only used for dynamic updates currently */
|
|
#ifndef BIND_UPDATE
|
|
if (dp1->d_mark != dp2->d_mark)
|
|
return (1); /* old and new RR's are distinct */
|
|
#endif
|
|
if (dp1->d_rcode && dp2->d_rcode)
|
|
return ((dp1->d_rcode == dp1->d_rcode)?0:1);
|
|
if (dp1->d_rcode || dp2->d_rcode)
|
|
return (1);
|
|
|
|
switch (dp1->d_type) {
|
|
|
|
case T_A:
|
|
case T_WKS:
|
|
case T_NULL:
|
|
case T_NSAP:
|
|
case T_AAAA:
|
|
case T_LOC:
|
|
case T_KEY:
|
|
/* Only binary data */
|
|
return (memcmp(dp1->d_data, dp2->d_data, dp1->d_size));
|
|
|
|
case T_NS:
|
|
case T_CNAME:
|
|
case T_PTR:
|
|
case T_MB:
|
|
case T_MG:
|
|
case T_MR:
|
|
/* Only a domain name */
|
|
return (strcasecmp((char *)dp1->d_data, (char *)dp2->d_data));
|
|
|
|
case T_SIG:
|
|
/* Binary data, a domain name, more binary data */
|
|
if (dp1->d_size < NS_SIG_SIGNER)
|
|
return (1);
|
|
if (memcmp(dp1->d_data, dp2->d_data, NS_SIG_SIGNER))
|
|
return (1);
|
|
len = NS_SIG_SIGNER +
|
|
strlen((char *)dp1->d_data + NS_SIG_SIGNER);
|
|
if (strcasecmp((char *)dp1->d_data + NS_SIG_SIGNER,
|
|
(char *)dp2->d_data + NS_SIG_SIGNER))
|
|
return (1);
|
|
return (memcmp(dp1->d_data + len,
|
|
dp2->d_data + len,
|
|
dp1->d_size - len));
|
|
|
|
case T_NXT:
|
|
/* First a domain name, then binary data */
|
|
if (strcasecmp((char *)dp1->d_data, (char *)dp2->d_data))
|
|
return (1);
|
|
len = strlen((char *)dp1->d_data)+1;
|
|
return (memcmp(dp1->d_data + len,
|
|
dp2->d_data + len,
|
|
dp1->d_size - len));
|
|
|
|
case T_HINFO:
|
|
case T_ISDN:
|
|
cp1 = dp1->d_data;
|
|
cp2 = dp2->d_data;
|
|
len = *cp1;
|
|
len2 = *cp2;
|
|
if (len != len2)
|
|
return (1);
|
|
if (strncasecmp((char *)++cp1, (char *)++cp2, len))
|
|
return (1);
|
|
cp1 += len;
|
|
cp2 += len;
|
|
len = *cp1;
|
|
len2 = *cp2;
|
|
if (len != len2)
|
|
return (1);
|
|
return (strncasecmp((char *)++cp1, (char *)++cp2, len));
|
|
|
|
case T_SOA:
|
|
case T_MINFO:
|
|
case T_RP:
|
|
if (strcasecmp((char *)dp1->d_data, (char *)dp2->d_data))
|
|
return (1);
|
|
cp1 = dp1->d_data + strlen((char *)dp1->d_data) + 1;
|
|
cp2 = dp2->d_data + strlen((char *)dp2->d_data) + 1;
|
|
if (dp1->d_type != T_SOA)
|
|
return (strcasecmp((char *)cp1, (char *)cp2));
|
|
if (strcasecmp((char *)cp1, (char *)cp2))
|
|
return (1);
|
|
cp1 += strlen((char *)cp1) + 1;
|
|
cp2 += strlen((char *)cp2) + 1;
|
|
return (memcmp(cp1, cp2, INT32SZ * 5));
|
|
|
|
case T_NAPTR: {
|
|
int t1,t2;
|
|
|
|
if (dp1->d_size != dp2->d_size)
|
|
return (1);
|
|
cp1 = dp1->d_data;
|
|
cp2 = dp2->d_data;
|
|
|
|
/* Order */
|
|
if (*cp1++ != *cp2++ || *cp1++ != *cp2++)
|
|
return (1);
|
|
|
|
/* Preference */
|
|
if (*cp1++ != *cp2++ || *cp1++ != *cp2++)
|
|
return (1);
|
|
|
|
/* Flags */
|
|
t1 = *cp1++; t2 = *cp2++;
|
|
if (t1 != t2 || memcmp(cp1, cp2, t1))
|
|
return (1);
|
|
cp1 += t1; cp2 += t2;
|
|
|
|
/* Services */
|
|
t1 = *cp1++; t2 = *cp2++;
|
|
if (t1 != t2 || memcmp(cp1, cp2, t1))
|
|
return (1);
|
|
cp1 += t1; cp2 += t2;
|
|
|
|
/* Regexp */
|
|
t1 = *cp1++; t2 = *cp2++;
|
|
if (t1 != t2 || memcmp(cp1, cp2, t1))
|
|
return (1);
|
|
cp1 += t1; cp2 += t2;
|
|
|
|
/* Replacement */
|
|
t1 = strlen((char *)cp1); t2 = strlen((char *)cp2);
|
|
if (t1 != t2 || memcmp(cp1, cp2, t1))
|
|
return (1);
|
|
cp1 += t1 + 1; cp2 += t2 + 1;
|
|
|
|
/* they all checked out! */
|
|
return (0);
|
|
}
|
|
|
|
case T_MX:
|
|
case T_AFSDB:
|
|
case T_RT:
|
|
case T_SRV:
|
|
cp1 = dp1->d_data;
|
|
cp2 = dp2->d_data;
|
|
if (*cp1++ != *cp2++ || *cp1++ != *cp2++) /* cmp prio */
|
|
return (1);
|
|
if (dp1->d_type == T_SRV) {
|
|
if (*cp1++ != *cp2++ || *cp1++ != *cp2++) /* weight */
|
|
return (1);
|
|
if (*cp1++ != *cp2++ || *cp1++ != *cp2++) /* port */
|
|
return (1);
|
|
}
|
|
return (strcasecmp((char *)cp1, (char *)cp2));
|
|
|
|
case T_PX:
|
|
cp1 = dp1->d_data;
|
|
cp2 = dp2->d_data;
|
|
if (*cp1++ != *cp2++ || *cp1++ != *cp2++) /* cmp prio */
|
|
return (1);
|
|
if (strcasecmp((char *)cp1, (char *)cp2))
|
|
return (1);
|
|
cp1 += strlen((char *)cp1) + 1;
|
|
cp2 += strlen((char *)cp2) + 1;
|
|
return (strcasecmp((char *)cp1, (char *)cp2));
|
|
|
|
case T_TXT:
|
|
case T_X25:
|
|
if (dp1->d_size != dp2->d_size)
|
|
return (1);
|
|
return (memcmp(dp1->d_data, dp2->d_data, dp1->d_size));
|
|
|
|
default:
|
|
return (1);
|
|
}
|
|
}
|