query.c revision 76db58eb818dc4839fa816df6a1a1ecb2c7a6bd0
/*
* Copyright (C) 2004-2011 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC 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.
*/
/* $Id: query.c,v 1.362 2011/04/27 17:46:46 each Exp $ */
/*! \file */
#include <config.h>
#include <string.h>
#include <isc/hex.h>
#include <isc/mem.h>
#include <isc/stats.h>
#include <isc/util.h>
#include <dns/adb.h>
#include <dns/byaddr.h>
#include <dns/db.h>
#include <dns/dlz.h>
#include <dns/dns64.h>
#include <dns/dnssec.h>
#include <dns/events.h>
#include <dns/message.h>
#include <dns/ncache.h>
#include <dns/nsec3.h>
#include <dns/order.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rdatastruct.h>
#include <dns/rdatatype.h>
#include <dns/resolver.h>
#include <dns/result.h>
#include <dns/stats.h>
#include <dns/tkey.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <dns/zt.h>
#include <named/client.h>
#include <named/globals.h>
#include <named/log.h>
#include <named/server.h>
#include <named/sortlist.h>
#include <named/xfrout.h>
#if 0
/*
* It has been recommended that DNS64 be changed to return excluded
* AAAA addresses if DNS64 synthesis does not occur. This minimises
* the impact on the lookup results. While most DNS AAAA lookups are
* done to send IP packets to a host, not all of them are and filtering
* excluded addresses has a negative impact on those uses.
*/
#define dns64_bis_return_excluded_addresses 1
#endif
/*% Partial answer? */
#define PARTIALANSWER(c) (((c)->query.attributes & \
NS_QUERYATTR_PARTIALANSWER) != 0)
/*% Use Cache? */
#define USECACHE(c) (((c)->query.attributes & \
NS_QUERYATTR_CACHEOK) != 0)
/*% Recursion OK? */
#define RECURSIONOK(c) (((c)->query.attributes & \
NS_QUERYATTR_RECURSIONOK) != 0)
/*% Recursing? */
#define RECURSING(c) (((c)->query.attributes & \
NS_QUERYATTR_RECURSING) != 0)
/*% Cache glue ok? */
#define CACHEGLUEOK(c) (((c)->query.attributes & \
NS_QUERYATTR_CACHEGLUEOK) != 0)
/*% Want Recursion? */
#define WANTRECURSION(c) (((c)->query.attributes & \
NS_QUERYATTR_WANTRECURSION) != 0)
/*% Want DNSSEC? */
#define WANTDNSSEC(c) (((c)->attributes & \
NS_CLIENTATTR_WANTDNSSEC) != 0)
/*% No authority? */
#define NOAUTHORITY(c) (((c)->query.attributes & \
NS_QUERYATTR_NOAUTHORITY) != 0)
/*% No additional? */
#define NOADDITIONAL(c) (((c)->query.attributes & \
NS_QUERYATTR_NOADDITIONAL) != 0)
/*% Secure? */
#define SECURE(c) (((c)->query.attributes & \
NS_QUERYATTR_SECURE) != 0)
/*% DNS64 A lookup? */
#define DNS64(c) (((c)->query.attributes & \
NS_QUERYATTR_DNS64) != 0)
#define DNS64EXCLUDE(c) (((c)->query.attributes & \
NS_QUERYATTR_DNS64EXCLUDE) != 0)
/*% No QNAME Proof? */
#define NOQNAME(r) (((r)->attributes & \
DNS_RDATASETATTR_NOQNAME) != 0)
#if 0
#define CTRACE(m) isc_log_write(ns_g_lctx, \
NS_LOGCATEGORY_CLIENT, \
NS_LOGMODULE_QUERY, \
ISC_LOG_DEBUG(3), \
"client %p: %s", client, (m))
#define QTRACE(m) isc_log_write(ns_g_lctx, \
NS_LOGCATEGORY_GENERAL, \
NS_LOGMODULE_QUERY, \
ISC_LOG_DEBUG(3), \
"query %p: %s", query, (m))
#else
#define CTRACE(m) ((void)m)
#define QTRACE(m) ((void)m)
#endif
#define DNS_GETDB_NOEXACT 0x01U
#define DNS_GETDB_NOLOG 0x02U
#define DNS_GETDB_PARTIAL 0x04U
#define DNS_GETDB_IGNOREACL 0x08U
#define PENDINGOK(x) (((x) & DNS_DBFIND_PENDINGOK) != 0)
typedef struct client_additionalctx {
ns_client_t *client;
dns_rdataset_t *rdataset;
} client_additionalctx_t;
static isc_result_t
query_find(ns_client_t *client, dns_fetchevent_t *event, dns_rdatatype_t qtype);
static isc_boolean_t
validate(ns_client_t *client, dns_db_t *db, dns_name_t *name,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
static void
query_findclosestnsec3(dns_name_t *qname, dns_db_t *db,
dns_dbversion_t *version, ns_client_t *client,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
dns_name_t *fname, isc_boolean_t exact,
dns_name_t *found);
static inline void
log_queryerror(ns_client_t *client, isc_result_t result, int line, int level);
static void
rpz_st_clear(ns_client_t *client);
/*%
* Increment query statistics counters.
*/
static inline void
inc_stats(ns_client_t *client, isc_statscounter_t counter) {
dns_zone_t *zone = client->query.authzone;
isc_stats_increment(ns_g_server->nsstats, counter);
if (zone != NULL) {
isc_stats_t *zonestats = dns_zone_getrequeststats(zone);
if (zonestats != NULL)
isc_stats_increment(zonestats, counter);
}
}
static void
query_send(ns_client_t *client) {
isc_statscounter_t counter;
if ((client->message->flags & DNS_MESSAGEFLAG_AA) == 0)
inc_stats(client, dns_nsstatscounter_nonauthans);
else
inc_stats(client, dns_nsstatscounter_authans);
if (client->message->rcode == dns_rcode_noerror) {
if (ISC_LIST_EMPTY(client->message->sections[DNS_SECTION_ANSWER])) {
if (client->query.isreferral) {
counter = dns_nsstatscounter_referral;
} else {
counter = dns_nsstatscounter_nxrrset;
}
} else {
counter = dns_nsstatscounter_success;
}
} else if (client->message->rcode == dns_rcode_nxdomain) {
counter = dns_nsstatscounter_nxdomain;
} else {
/* We end up here in case of YXDOMAIN, and maybe others */
counter = dns_nsstatscounter_failure;
}
inc_stats(client, counter);
ns_client_send(client);
}
static void
query_error(ns_client_t *client, isc_result_t result, int line) {
int loglevel = ISC_LOG_DEBUG(3);
switch (result) {
case DNS_R_SERVFAIL:
loglevel = ISC_LOG_DEBUG(1);
inc_stats(client, dns_nsstatscounter_servfail);
break;
case DNS_R_FORMERR:
inc_stats(client, dns_nsstatscounter_formerr);
break;
default:
inc_stats(client, dns_nsstatscounter_failure);
break;
}
log_queryerror(client, result, line, loglevel);
ns_client_error(client, result);
}
static void
query_next(ns_client_t *client, isc_result_t result) {
if (result == DNS_R_DUPLICATE)
inc_stats(client, dns_nsstatscounter_duplicate);
else if (result == DNS_R_DROP)
inc_stats(client, dns_nsstatscounter_dropped);
else
inc_stats(client, dns_nsstatscounter_failure);
ns_client_next(client, result);
}
static inline void
query_freefreeversions(ns_client_t *client, isc_boolean_t everything) {
ns_dbversion_t *dbversion, *dbversion_next;
unsigned int i;
for (dbversion = ISC_LIST_HEAD(client->query.freeversions), i = 0;
dbversion != NULL;
dbversion = dbversion_next, i++)
{
dbversion_next = ISC_LIST_NEXT(dbversion, link);
/*
* If we're not freeing everything, we keep the first three
* dbversions structures around.
*/
if (i > 3 || everything) {
ISC_LIST_UNLINK(client->query.freeversions, dbversion,
link);
isc_mem_put(client->mctx, dbversion,
sizeof(*dbversion));
}
}
}
void
ns_query_cancel(ns_client_t *client) {
LOCK(&client->query.fetchlock);
if (client->query.fetch != NULL) {
dns_resolver_cancelfetch(client->query.fetch);
client->query.fetch = NULL;
}
UNLOCK(&client->query.fetchlock);
}
static inline void
query_putrdataset(ns_client_t *client, dns_rdataset_t **rdatasetp) {
dns_rdataset_t *rdataset = *rdatasetp;
CTRACE("query_putrdataset");
if (rdataset != NULL) {
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
dns_message_puttemprdataset(client->message, rdatasetp);
}
CTRACE("query_putrdataset: done");
}
static inline void
query_reset(ns_client_t *client, isc_boolean_t everything) {
isc_buffer_t *dbuf, *dbuf_next;
ns_dbversion_t *dbversion, *dbversion_next;
/*%
* Reset the query state of a client to its default state.
*/
/*
* Cancel the fetch if it's running.
*/
ns_query_cancel(client);
/*
* Cleanup any active versions.
*/
for (dbversion = ISC_LIST_HEAD(client->query.activeversions);
dbversion != NULL;
dbversion = dbversion_next) {
dbversion_next = ISC_LIST_NEXT(dbversion, link);
dns_db_closeversion(dbversion->db, &dbversion->version,
ISC_FALSE);
dns_db_detach(&dbversion->db);
ISC_LIST_INITANDAPPEND(client->query.freeversions,
dbversion, link);
}
ISC_LIST_INIT(client->query.activeversions);
if (client->query.authdb != NULL)
dns_db_detach(&client->query.authdb);
if (client->query.authzone != NULL)
dns_zone_detach(&client->query.authzone);
if (client->query.dns64_aaaa != NULL)
query_putrdataset(client, &client->query.dns64_aaaa);
if (client->query.dns64_sigaaaa != NULL)
query_putrdataset(client, &client->query.dns64_sigaaaa);
if (client->query.dns64_aaaaok != NULL) {
isc_mem_put(client->mctx, client->query.dns64_aaaaok,
client->query.dns64_aaaaoklen *
sizeof(isc_boolean_t));
client->query.dns64_aaaaok = NULL;
client->query.dns64_aaaaoklen = 0;
}
query_freefreeversions(client, everything);
for (dbuf = ISC_LIST_HEAD(client->query.namebufs);
dbuf != NULL;
dbuf = dbuf_next) {
dbuf_next = ISC_LIST_NEXT(dbuf, link);
if (dbuf_next != NULL || everything) {
ISC_LIST_UNLINK(client->query.namebufs, dbuf, link);
isc_buffer_free(&dbuf);
}
}
if (client->query.restarts > 0) {
/*
* client->query.qname was dynamically allocated.
*/
dns_message_puttempname(client->message,
&client->query.qname);
}
client->query.qname = NULL;
client->query.attributes = (NS_QUERYATTR_RECURSIONOK |
NS_QUERYATTR_CACHEOK |
NS_QUERYATTR_SECURE);
client->query.restarts = 0;
client->query.timerset = ISC_FALSE;
if (client->query.rpz_st != NULL) {
rpz_st_clear(client);
if (everything) {
isc_mem_put(client->mctx, client->query.rpz_st,
sizeof(*client->query.rpz_st));
client->query.rpz_st = NULL;
}
}
client->query.origqname = NULL;
client->query.dboptions = 0;
client->query.fetchoptions = 0;
client->query.gluedb = NULL;
client->query.authdbset = ISC_FALSE;
client->query.isreferral = ISC_FALSE;
client->query.dns64_options = 0;
client->query.dns64_ttl = ISC_UINT32_MAX;
}
static void
query_next_callback(ns_client_t *client) {
query_reset(client, ISC_FALSE);
}
void
ns_query_free(ns_client_t *client) {
query_reset(client, ISC_TRUE);
}
static inline isc_result_t
query_newnamebuf(ns_client_t *client) {
isc_buffer_t *dbuf;
isc_result_t result;
CTRACE("query_newnamebuf");
/*%
* Allocate a name buffer.
*/
dbuf = NULL;
result = isc_buffer_allocate(client->mctx, &dbuf, 1024);
if (result != ISC_R_SUCCESS) {
CTRACE("query_newnamebuf: isc_buffer_allocate failed: done");
return (result);
}
ISC_LIST_APPEND(client->query.namebufs, dbuf, link);
CTRACE("query_newnamebuf: done");
return (ISC_R_SUCCESS);
}
static inline isc_buffer_t *
query_getnamebuf(ns_client_t *client) {
isc_buffer_t *dbuf;
isc_result_t result;
isc_region_t r;
CTRACE("query_getnamebuf");
/*%
* Return a name buffer with space for a maximal name, allocating
* a new one if necessary.
*/
if (ISC_LIST_EMPTY(client->query.namebufs)) {
result = query_newnamebuf(client);
if (result != ISC_R_SUCCESS) {
CTRACE("query_getnamebuf: query_newnamebuf failed: done");
return (NULL);
}
}
dbuf = ISC_LIST_TAIL(client->query.namebufs);
INSIST(dbuf != NULL);
isc_buffer_availableregion(dbuf, &r);
if (r.length < 255) {
result = query_newnamebuf(client);
if (result != ISC_R_SUCCESS) {
CTRACE("query_getnamebuf: query_newnamebuf failed: done");
return (NULL);
}
dbuf = ISC_LIST_TAIL(client->query.namebufs);
isc_buffer_availableregion(dbuf, &r);
INSIST(r.length >= 255);
}
CTRACE("query_getnamebuf: done");
return (dbuf);
}
static inline void
query_keepname(ns_client_t *client, dns_name_t *name, isc_buffer_t *dbuf) {
isc_region_t r;
CTRACE("query_keepname");
/*%
* 'name' is using space in 'dbuf', but 'dbuf' has not yet been
* adjusted to take account of that. We do the adjustment.
*/
REQUIRE((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED) != 0);
dns_name_toregion(name, &r);
isc_buffer_add(dbuf, r.length);
dns_name_setbuffer(name, NULL);
client->query.attributes &= ~NS_QUERYATTR_NAMEBUFUSED;
}
static inline void
query_releasename(ns_client_t *client, dns_name_t **namep) {
dns_name_t *name = *namep;
/*%
* 'name' is no longer needed. Return it to our pool of temporary
* names. If it is using a name buffer, relinquish its exclusive
* rights on the buffer.
*/
CTRACE("query_releasename");
if (dns_name_hasbuffer(name)) {
INSIST((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED)
!= 0);
client->query.attributes &= ~NS_QUERYATTR_NAMEBUFUSED;
}
dns_message_puttempname(client->message, namep);
CTRACE("query_releasename: done");
}
static inline dns_name_t *
query_newname(ns_client_t *client, isc_buffer_t *dbuf,
isc_buffer_t *nbuf)
{
dns_name_t *name;
isc_region_t r;
isc_result_t result;
REQUIRE((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED) == 0);
CTRACE("query_newname");
name = NULL;
result = dns_message_gettempname(client->message, &name);
if (result != ISC_R_SUCCESS) {
CTRACE("query_newname: dns_message_gettempname failed: done");
return (NULL);
}
isc_buffer_availableregion(dbuf, &r);
isc_buffer_init(nbuf, r.base, r.length);
dns_name_init(name, NULL);
dns_name_setbuffer(name, nbuf);
client->query.attributes |= NS_QUERYATTR_NAMEBUFUSED;
CTRACE("query_newname: done");
return (name);
}
static inline dns_rdataset_t *
query_newrdataset(ns_client_t *client) {
dns_rdataset_t *rdataset;
isc_result_t result;
CTRACE("query_newrdataset");
rdataset = NULL;
result = dns_message_gettemprdataset(client->message, &rdataset);
if (result != ISC_R_SUCCESS) {
CTRACE("query_newrdataset: "
"dns_message_gettemprdataset failed: done");
return (NULL);
}
dns_rdataset_init(rdataset);
CTRACE("query_newrdataset: done");
return (rdataset);
}
static inline isc_result_t
query_newdbversion(ns_client_t *client, unsigned int n) {
unsigned int i;
ns_dbversion_t *dbversion;
for (i = 0; i < n; i++) {
dbversion = isc_mem_get(client->mctx, sizeof(*dbversion));
if (dbversion != NULL) {
dbversion->db = NULL;
dbversion->version = NULL;
ISC_LIST_INITANDAPPEND(client->query.freeversions,
dbversion, link);
} else {
/*
* We only return ISC_R_NOMEMORY if we couldn't
* allocate anything.
*/
if (i == 0)
return (ISC_R_NOMEMORY);
else
return (ISC_R_SUCCESS);
}
}
return (ISC_R_SUCCESS);
}
static inline ns_dbversion_t *
query_getdbversion(ns_client_t *client) {
isc_result_t result;
ns_dbversion_t *dbversion;
if (ISC_LIST_EMPTY(client->query.freeversions)) {
result = query_newdbversion(client, 1);
if (result != ISC_R_SUCCESS)
return (NULL);
}
dbversion = ISC_LIST_HEAD(client->query.freeversions);
INSIST(dbversion != NULL);
ISC_LIST_UNLINK(client->query.freeversions, dbversion, link);
return (dbversion);
}
isc_result_t
ns_query_init(ns_client_t *client) {
isc_result_t result;
ISC_LIST_INIT(client->query.namebufs);
ISC_LIST_INIT(client->query.activeversions);
ISC_LIST_INIT(client->query.freeversions);
client->query.restarts = 0;
client->query.timerset = ISC_FALSE;
client->query.rpz_st = NULL;
client->query.qname = NULL;
result = isc_mutex_init(&client->query.fetchlock);
if (result != ISC_R_SUCCESS)
return (result);
client->query.fetch = NULL;
client->query.authdb = NULL;
client->query.authzone = NULL;
client->query.authdbset = ISC_FALSE;
client->query.isreferral = ISC_FALSE;
client->query.dns64_aaaa = NULL;
client->query.dns64_sigaaaa = NULL;
client->query.dns64_aaaaok = NULL;
client->query.dns64_aaaaoklen = 0;
query_reset(client, ISC_FALSE);
result = query_newdbversion(client, 3);
if (result != ISC_R_SUCCESS) {
DESTROYLOCK(&client->query.fetchlock);
return (result);
}
result = query_newnamebuf(client);
if (result != ISC_R_SUCCESS)
query_freefreeversions(client, ISC_TRUE);
return (result);
}
static inline ns_dbversion_t *
query_findversion(ns_client_t *client, dns_db_t *db)
{
ns_dbversion_t *dbversion;
/*%
* We may already have done a query related to this
* database. If so, we must be sure to make subsequent
* queries from the same version.
*/
for (dbversion = ISC_LIST_HEAD(client->query.activeversions);
dbversion != NULL;
dbversion = ISC_LIST_NEXT(dbversion, link)) {
if (dbversion->db == db)
break;
}
if (dbversion == NULL) {
/*
* This is a new zone for this query. Add it to
* the active list.
*/
dbversion = query_getdbversion(client);
if (dbversion == NULL)
return (NULL);
dns_db_attach(db, &dbversion->db);
dns_db_currentversion(db, &dbversion->version);
dbversion->acl_checked = ISC_FALSE;
ISC_LIST_APPEND(client->query.activeversions,
dbversion, link);
}
return (dbversion);
}
static inline isc_result_t
query_validatezonedb(ns_client_t *client, dns_name_t *name,
dns_rdatatype_t qtype, unsigned int options,
dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t **versionp)
{
isc_result_t result;
dns_acl_t *queryacl;
ns_dbversion_t *dbversion;
REQUIRE(zone != NULL);
REQUIRE(db != NULL);
/*
* This limits our searching to the zone where the first name
* (the query target) was looked for. This prevents following
* CNAMES or DNAMES into other zones and prevents returning
* additional data from other zones.
*/
if (!client->view->additionalfromauth &&
client->query.authdbset &&
db != client->query.authdb)
return (DNS_R_REFUSED);
/*
* Non recursive query to a static-stub zone is prohibited; its
* zone content is not public data, but a part of local configuration
* and should not be disclosed.
*/
if (dns_zone_gettype(zone) == dns_zone_staticstub &&
!RECURSIONOK(client)) {
return (DNS_R_REFUSED);
}
/*
* If the zone has an ACL, we'll check it, otherwise
* we use the view's "allow-query" ACL. Each ACL is only checked
* once per query.
*
* Also, get the database version to use.
*/
/*
* Get the current version of this database.
*/
dbversion = query_findversion(client, db);
if (dbversion == NULL)
return (DNS_R_SERVFAIL);
if ((options & DNS_GETDB_IGNOREACL) != 0)
goto approved;
if (dbversion->acl_checked) {
if (!dbversion->queryok)
return (DNS_R_REFUSED);
goto approved;
}
queryacl = dns_zone_getqueryacl(zone);
if (queryacl == NULL) {
queryacl = client->view->queryacl;
if ((client->query.attributes &
NS_QUERYATTR_QUERYOKVALID) != 0) {
/*
* We've evaluated the view's queryacl already. If
* NS_QUERYATTR_QUERYOK is set, then the client is
* allowed to make queries, otherwise the query should
* be refused.
*/
dbversion->acl_checked = ISC_TRUE;
if ((client->query.attributes &
NS_QUERYATTR_QUERYOK) == 0) {
dbversion->queryok = ISC_FALSE;
return (DNS_R_REFUSED);
}
dbversion->queryok = ISC_TRUE;
goto approved;
}
}
result = ns_client_checkaclsilent(client, NULL, queryacl, ISC_TRUE);
if ((options & DNS_GETDB_NOLOG) == 0) {
char msg[NS_CLIENT_ACLMSGSIZE("query")];
if (result == ISC_R_SUCCESS) {
if (isc_log_wouldlog(ns_g_lctx, ISC_LOG_DEBUG(3))) {
ns_client_aclmsg("query", name, qtype,
client->view->rdclass,
msg, sizeof(msg));
ns_client_log(client,
DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY,
ISC_LOG_DEBUG(3),
"%s approved", msg);
}
} else {
ns_client_aclmsg("query", name, qtype,
client->view->rdclass,
msg, sizeof(msg));
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY, ISC_LOG_INFO,
"%s denied", msg);
}
}
if (queryacl == client->view->queryacl) {
if (result == ISC_R_SUCCESS) {
/*
* We were allowed by the default
* "allow-query" ACL. Remember this so we
* don't have to check again.
*/
client->query.attributes |= NS_QUERYATTR_QUERYOK;
}
/*
* We've now evaluated the view's query ACL, and
* the NS_QUERYATTR_QUERYOK attribute is now valid.
*/
client->query.attributes |= NS_QUERYATTR_QUERYOKVALID;
}
dbversion->acl_checked = ISC_TRUE;
if (result != ISC_R_SUCCESS) {
dbversion->queryok = ISC_FALSE;
return (DNS_R_REFUSED);
}
approved:
/* Transfer ownership, if necessary. */
if (versionp != NULL)
*versionp = dbversion->version;
return (ISC_R_SUCCESS);
}
static inline isc_result_t
query_getzonedb(ns_client_t *client, dns_name_t *name, dns_rdatatype_t qtype,
unsigned int options, dns_zone_t **zonep, dns_db_t **dbp,
dns_dbversion_t **versionp)
{
isc_result_t result;
unsigned int ztoptions;
dns_zone_t *zone = NULL;
dns_db_t *db = NULL;
isc_boolean_t partial = ISC_FALSE;
REQUIRE(zonep != NULL && *zonep == NULL);
REQUIRE(dbp != NULL && *dbp == NULL);
/*%
* Find a zone database to answer the query.
*/
ztoptions = ((options & DNS_GETDB_NOEXACT) != 0) ?
DNS_ZTFIND_NOEXACT : 0;
result = dns_zt_find(client->view->zonetable, name, ztoptions, NULL,
&zone);
if (result == DNS_R_PARTIALMATCH)
partial = ISC_TRUE;
if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH)
result = dns_zone_getdb(zone, &db);
if (result != ISC_R_SUCCESS)
goto fail;
result = query_validatezonedb(client, name, qtype, options, zone, db,
versionp);
if (result != ISC_R_SUCCESS)
goto fail;
/* Transfer ownership. */
*zonep = zone;
*dbp = db;
if (partial && (options & DNS_GETDB_PARTIAL) != 0)
return (DNS_R_PARTIALMATCH);
return (ISC_R_SUCCESS);
fail:
if (zone != NULL)
dns_zone_detach(&zone);
if (db != NULL)
dns_db_detach(&db);
return (result);
}
static void
rpz_log(ns_client_t *client) {
char namebuf1[DNS_NAME_FORMATSIZE];
char namebuf2[DNS_NAME_FORMATSIZE];
dns_rpz_st_t *st;
const char *pat;
if (!ns_g_server->log_queries ||
!isc_log_wouldlog(ns_g_lctx, DNS_RPZ_INFO_LEVEL))
return;
st = client->query.rpz_st;
dns_name_format(client->query.qname, namebuf1, sizeof(namebuf1));
dns_name_format(st->qname, namebuf2, sizeof(namebuf2));
switch (st->m.policy) {
case DNS_RPZ_POLICY_NO_OP:
pat ="response policy %s rewrite %s NO-OP using %s";
break;
case DNS_RPZ_POLICY_NXDOMAIN:
pat = "response policy %s rewrite %s to NXDOMAIN using %s";
break;
case DNS_RPZ_POLICY_NODATA:
pat = "response policy %s rewrite %s to NODATA using %s";
break;
case DNS_RPZ_POLICY_RECORD:
case DNS_RPZ_POLICY_CNAME:
pat = "response policy %s rewrite %s using %s";
break;
default:
INSIST(0);
}
ns_client_log(client, NS_LOGCATEGORY_QUERIES, NS_LOGMODULE_QUERY,
DNS_RPZ_INFO_LEVEL, pat, dns_rpz_type2str(st->m.type),
namebuf1, namebuf2);
}
static void
rpz_fail_log(ns_client_t *client, int level, dns_rpz_type_t rpz_type,
dns_name_t *name, const char *str, isc_result_t result)
{
char namebuf1[DNS_NAME_FORMATSIZE];
char namebuf2[DNS_NAME_FORMATSIZE];
if (!ns_g_server->log_queries || !isc_log_wouldlog(ns_g_lctx, level))
return;
dns_name_format(client->query.qname, namebuf1, sizeof(namebuf1));
dns_name_format(name, namebuf2, sizeof(namebuf2));
ns_client_log(client, NS_LOGCATEGORY_QUERY_EERRORS,
NS_LOGMODULE_QUERY, level,
"response policy %s rewrite %s via %s %sfailed: %s",
dns_rpz_type2str(rpz_type),
namebuf1, namebuf2, str, isc_result_totext(result));
}
/*
* Get a policy rewrite zone database.
*/
static isc_result_t
rpz_getdb(ns_client_t *client, dns_rpz_type_t rpz_type,
dns_name_t *rpz_qname, dns_zone_t **zonep,
dns_db_t **dbp, dns_dbversion_t **versionp)
{
char namebuf1[DNS_NAME_FORMATSIZE];
char namebuf2[DNS_NAME_FORMATSIZE];
dns_dbversion_t *rpz_version = NULL;
isc_result_t result;
result = query_getzonedb(client, rpz_qname, dns_rdatatype_any,
DNS_GETDB_IGNOREACL, zonep, dbp, &rpz_version);
if (result == ISC_R_SUCCESS) {
if (ns_g_server->log_queries &&
isc_log_wouldlog(ns_g_lctx, DNS_RPZ_DEBUG_LEVEL2)) {
dns_name_format(client->query.qname, namebuf1,
sizeof(namebuf1));
dns_name_format(rpz_qname, namebuf2, sizeof(namebuf2));
ns_client_log(client, NS_LOGCATEGORY_QUERIES,
NS_LOGMODULE_QUERY, DNS_RPZ_DEBUG_LEVEL2,
"try rpz %s rewrite %s via %s",
dns_rpz_type2str(rpz_type),
namebuf1, namebuf2);
}
*versionp = rpz_version;
return (ISC_R_SUCCESS);
}
rpz_fail_log(client, DNS_RPZ_ERROR_LEVEL, rpz_type, rpz_qname,
"query_getzonedb() ", result);
return (result);
}
static inline isc_result_t
query_getcachedb(ns_client_t *client, dns_name_t *name, dns_rdatatype_t qtype,
dns_db_t **dbp, unsigned int options)
{
isc_result_t result;
isc_boolean_t check_acl;
dns_db_t *db = NULL;
REQUIRE(dbp != NULL && *dbp == NULL);
/*%
* Find a cache database to answer the query.
* This may fail with DNS_R_REFUSED if the client
* is not allowed to use the cache.
*/
if (!USECACHE(client))
return (DNS_R_REFUSED);
dns_db_attach(client->view->cachedb, &db);
if ((client->query.attributes & NS_QUERYATTR_CACHEACLOKVALID) != 0) {
/*
* We've evaluated the view's cacheacl already. If
* NS_QUERYATTR_CACHEACLOK is set, then the client is
* allowed to make queries, otherwise the query should
* be refused.
*/
check_acl = ISC_FALSE;
if ((client->query.attributes & NS_QUERYATTR_CACHEACLOK) == 0)
goto refuse;
} else {
/*
* We haven't evaluated the view's queryacl yet.
*/
check_acl = ISC_TRUE;
}
if (check_acl) {
isc_boolean_t log = ISC_TF((options & DNS_GETDB_NOLOG) == 0);
char msg[NS_CLIENT_ACLMSGSIZE("query (cache)")];
result = ns_client_checkaclsilent(client, NULL,
client->view->cacheacl,
ISC_TRUE);
if (result == ISC_R_SUCCESS) {
/*
* We were allowed by the "allow-query-cache" ACL.
* Remember this so we don't have to check again.
*/
client->query.attributes |=
NS_QUERYATTR_CACHEACLOK;
if (log && isc_log_wouldlog(ns_g_lctx,
ISC_LOG_DEBUG(3)))
{
ns_client_aclmsg("query (cache)", name, qtype,
client->view->rdclass,
msg, sizeof(msg));
ns_client_log(client,
DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY,
ISC_LOG_DEBUG(3),
"%s approved", msg);
}
} else if (log) {
ns_client_aclmsg("query (cache)", name, qtype,
client->view->rdclass, msg,
sizeof(msg));
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY, ISC_LOG_INFO,
"%s denied", msg);
}
/*
* We've now evaluated the view's query ACL, and
* the NS_QUERYATTR_CACHEACLOKVALID attribute is now valid.
*/
client->query.attributes |= NS_QUERYATTR_CACHEACLOKVALID;
if (result != ISC_R_SUCCESS)
goto refuse;
}
/* Approved. */
/* Transfer ownership. */
*dbp = db;
return (ISC_R_SUCCESS);
refuse:
result = DNS_R_REFUSED;
if (db != NULL)
dns_db_detach(&db);
return (result);
}
static inline isc_result_t
query_getdb(ns_client_t *client, dns_name_t *name, dns_rdatatype_t qtype,
unsigned int options, dns_zone_t **zonep, dns_db_t **dbp,
dns_dbversion_t **versionp, isc_boolean_t *is_zonep)
{
isc_result_t result;
isc_result_t tresult;
unsigned int namelabels;
unsigned int zonelabels;
dns_zone_t *zone = NULL;
dns_db_t *tdbp;
REQUIRE(zonep != NULL && *zonep == NULL);
tdbp = NULL;
/* Calculate how many labels are in name. */
namelabels = dns_name_countlabels(name);
zonelabels = 0;
/* Try to find name in bind's standard database. */
result = query_getzonedb(client, name, qtype, options, &zone,
dbp, versionp);
/* See how many labels are in the zone's name. */
if (result == ISC_R_SUCCESS && zone != NULL)
zonelabels = dns_name_countlabels(dns_zone_getorigin(zone));
/*
* If # zone labels < # name labels, try to find an even better match
* Only try if a DLZ driver is loaded for this view
*/
if (zonelabels < namelabels && client->view->dlzdatabase != NULL) {
tresult = dns_dlzfindzone(client->view, name,
zonelabels, &tdbp);
/* If we successful, we found a better match. */
if (tresult == ISC_R_SUCCESS) {
/*
* If the previous search returned a zone, detach it.
*/
if (zone != NULL)
dns_zone_detach(&zone);
/*
* If the previous search returned a database,
* detach it.
*/
if (*dbp != NULL)
dns_db_detach(dbp);
/*
* If the previous search returned a version, clear it.
*/
*versionp = NULL;
/*
* Get our database version.
*/
dns_db_currentversion(tdbp, versionp);
/*
* Be sure to return our database.
*/
*dbp = tdbp;
/*
* We return a null zone, No stats for DLZ zones.
*/
zone = NULL;
result = tresult;
}
}
/* If successful, Transfer ownership of zone. */
if (result == ISC_R_SUCCESS) {
*zonep = zone;
/*
* If neither attempt above succeeded, return the cache instead
*/
*is_zonep = ISC_TRUE;
} else if (result == ISC_R_NOTFOUND) {
result = query_getcachedb(client, name, qtype, dbp, options);
*is_zonep = ISC_FALSE;
}
return (result);
}
static inline isc_boolean_t
query_isduplicate(ns_client_t *client, dns_name_t *name,
dns_rdatatype_t type, dns_name_t **mnamep)
{
dns_section_t section;
dns_name_t *mname = NULL;
isc_result_t result;
CTRACE("query_isduplicate");
for (section = DNS_SECTION_ANSWER;
section <= DNS_SECTION_ADDITIONAL;
section++) {
result = dns_message_findname(client->message, section,
name, type, 0, &mname, NULL);
if (result == ISC_R_SUCCESS) {
/*
* We've already got this RRset in the response.
*/
CTRACE("query_isduplicate: true: done");
return (ISC_TRUE);
} else if (result == DNS_R_NXRRSET) {
/*
* The name exists, but the rdataset does not.
*/
if (section == DNS_SECTION_ADDITIONAL)
break;
} else
RUNTIME_CHECK(result == DNS_R_NXDOMAIN);
mname = NULL;
}
/*
* If the dns_name_t we're looking up is already in the message,
* we don't want to trigger the caller's name replacement logic.
*/
if (name == mname)
mname = NULL;
*mnamep = mname;
CTRACE("query_isduplicate: false: done");
return (ISC_FALSE);
}
static isc_result_t
query_addadditional(void *arg, dns_name_t *name, dns_rdatatype_t qtype) {
ns_client_t *client = arg;
isc_result_t result, eresult;
dns_dbnode_t *node;
dns_db_t *db;
dns_name_t *fname, *mname;
dns_rdataset_t *rdataset, *sigrdataset, *trdataset;
isc_buffer_t *dbuf;
isc_buffer_t b;
dns_dbversion_t *version;
isc_boolean_t added_something, need_addname;
dns_zone_t *zone;
dns_rdatatype_t type;
REQUIRE(NS_CLIENT_VALID(client));
REQUIRE(qtype != dns_rdatatype_any);
if (!WANTDNSSEC(client) && dns_rdatatype_isdnssec(qtype))
return (ISC_R_SUCCESS);
CTRACE("query_addadditional");
/*
* Initialization.
*/
eresult = ISC_R_SUCCESS;
fname = NULL;
rdataset = NULL;
sigrdataset = NULL;
trdataset = NULL;
db = NULL;
version = NULL;
node = NULL;
added_something = ISC_FALSE;
need_addname = ISC_FALSE;
zone = NULL;
/*
* We treat type A additional section processing as if it
* were "any address type" additional section processing.
* To avoid multiple lookups, we do an 'any' database
* lookup and iterate over the node.
*/
if (qtype == dns_rdatatype_a)
type = dns_rdatatype_any;
else
type = qtype;
/*
* Get some resources.
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
rdataset = query_newrdataset(client);
if (fname == NULL || rdataset == NULL)
goto cleanup;
if (WANTDNSSEC(client)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto cleanup;
}
/*
* Look for a zone database that might contain authoritative
* additional data.
*/
result = query_getzonedb(client, name, qtype, DNS_GETDB_NOLOG,
&zone, &db, &version);
if (result != ISC_R_SUCCESS)
goto try_cache;
CTRACE("query_addadditional: db_find");
/*
* Since we are looking for authoritative data, we do not set
* the GLUEOK flag. Glue will be looked for later, but not
* necessarily in the same database.
*/
node = NULL;
result = dns_db_find(db, name, version, type, client->query.dboptions,
client->now, &node, fname, rdataset,
sigrdataset);
if (result == ISC_R_SUCCESS) {
if (sigrdataset != NULL && !dns_db_issecure(db) &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
goto found;
}
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
version = NULL;
dns_db_detach(&db);
/*
* No authoritative data was found. The cache is our next best bet.
*/
try_cache:
result = query_getcachedb(client, name, qtype, &db, DNS_GETDB_NOLOG);
if (result != ISC_R_SUCCESS)
/*
* Most likely the client isn't allowed to query the cache.
*/
goto try_glue;
/*
* Attempt to validate glue.
*/
if (sigrdataset == NULL) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto cleanup;
}
result = dns_db_find(db, name, version, type,
client->query.dboptions |
DNS_DBFIND_GLUEOK | DNS_DBFIND_ADDITIONALOK,
client->now, &node, fname, rdataset,
sigrdataset);
if (result == DNS_R_GLUE &&
validate(client, db, fname, rdataset, sigrdataset))
result = ISC_R_SUCCESS;
if (!WANTDNSSEC(client))
query_putrdataset(client, &sigrdataset);
if (result == ISC_R_SUCCESS)
goto found;
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
dns_db_detach(&db);
try_glue:
/*
* No cached data was found. Glue is our last chance.
* RFC1035 sayeth:
*
* NS records cause both the usual additional section
* processing to locate a type A record, and, when used
* in a referral, a special search of the zone in which
* they reside for glue information.
*
* This is the "special search". Note that we must search
* the zone where the NS record resides, not the zone it
* points to, and that we only do the search in the delegation
* case (identified by client->query.gluedb being set).
*/
if (client->query.gluedb == NULL)
goto cleanup;
/*
* Don't poison caches using the bailiwick protection model.
*/
if (!dns_name_issubdomain(name, dns_db_origin(client->query.gluedb)))
goto cleanup;
dns_db_attach(client->query.gluedb, &db);
result = dns_db_find(db, name, version, type,
client->query.dboptions | DNS_DBFIND_GLUEOK,
client->now, &node, fname, rdataset,
sigrdataset);
if (!(result == ISC_R_SUCCESS ||
result == DNS_R_ZONECUT ||
result == DNS_R_GLUE))
goto cleanup;
found:
/*
* We have found a potential additional data rdataset, or
* at least a node to iterate over.
*/
query_keepname(client, fname, dbuf);
/*
* If we have an rdataset, add it to the additional data
* section.
*/
mname = NULL;
if (dns_rdataset_isassociated(rdataset) &&
!query_isduplicate(client, fname, type, &mname)) {
if (mname != NULL) {
query_releasename(client, &fname);
fname = mname;
} else
need_addname = ISC_TRUE;
ISC_LIST_APPEND(fname->list, rdataset, link);
trdataset = rdataset;
rdataset = NULL;
added_something = ISC_TRUE;
/*
* Note: we only add SIGs if we've added the type they cover,
* so we do not need to check if the SIG rdataset is already
* in the response.
*/
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
ISC_LIST_APPEND(fname->list, sigrdataset, link);
sigrdataset = NULL;
}
}
if (qtype == dns_rdatatype_a) {
/*
* We now go looking for A and AAAA records, along with
* their signatures.
*
* XXXRTH This code could be more efficient.
*/
if (rdataset != NULL) {
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
} else {
rdataset = query_newrdataset(client);
if (rdataset == NULL)
goto addname;
}
if (sigrdataset != NULL) {
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
} else if (WANTDNSSEC(client)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto addname;
}
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_a, 0,
client->now, rdataset,
sigrdataset);
if (result == DNS_R_NCACHENXDOMAIN)
goto addname;
if (result == DNS_R_NCACHENXRRSET) {
dns_rdataset_disassociate(rdataset);
/*
* Negative cache entries don't have sigrdatasets.
*/
INSIST(sigrdataset == NULL ||
! dns_rdataset_isassociated(sigrdataset));
}
if (result == ISC_R_SUCCESS) {
mname = NULL;
if (!query_isduplicate(client, fname,
dns_rdatatype_a, &mname)) {
if (mname != NULL) {
query_releasename(client, &fname);
fname = mname;
} else
need_addname = ISC_TRUE;
ISC_LIST_APPEND(fname->list, rdataset, link);
added_something = ISC_TRUE;
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
ISC_LIST_APPEND(fname->list,
sigrdataset, link);
sigrdataset =
query_newrdataset(client);
}
rdataset = query_newrdataset(client);
if (rdataset == NULL)
goto addname;
if (WANTDNSSEC(client) && sigrdataset == NULL)
goto addname;
} else {
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
}
}
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_aaaa, 0,
client->now, rdataset,
sigrdataset);
if (result == DNS_R_NCACHENXDOMAIN)
goto addname;
if (result == DNS_R_NCACHENXRRSET) {
dns_rdataset_disassociate(rdataset);
INSIST(sigrdataset == NULL ||
! dns_rdataset_isassociated(sigrdataset));
}
if (result == ISC_R_SUCCESS) {
mname = NULL;
if (!query_isduplicate(client, fname,
dns_rdatatype_aaaa, &mname)) {
if (mname != NULL) {
query_releasename(client, &fname);
fname = mname;
} else
need_addname = ISC_TRUE;
ISC_LIST_APPEND(fname->list, rdataset, link);
added_something = ISC_TRUE;
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
ISC_LIST_APPEND(fname->list,
sigrdataset, link);
sigrdataset = NULL;
}
rdataset = NULL;
}
}
}
addname:
CTRACE("query_addadditional: addname");
/*
* If we haven't added anything, then we're done.
*/
if (!added_something)
goto cleanup;
/*
* We may have added our rdatasets to an existing name, if so, then
* need_addname will be ISC_FALSE. Whether we used an existing name
* or a new one, we must set fname to NULL to prevent cleanup.
*/
if (need_addname)
dns_message_addname(client->message, fname,
DNS_SECTION_ADDITIONAL);
fname = NULL;
/*
* In a few cases, we want to add additional data for additional
* data. It's simpler to just deal with special cases here than
* to try to create a general purpose mechanism and allow the
* rdata implementations to do it themselves.
*
* This involves recursion, but the depth is limited. The
* most complex case is adding a SRV rdataset, which involves
* recursing to add address records, which in turn can cause
* recursion to add KEYs.
*/
if (type == dns_rdatatype_srv && trdataset != NULL) {
/*
* If we're adding SRV records to the additional data
* section, it's helpful if we add the SRV additional data
* as well.
*/
eresult = dns_rdataset_additionaldata(trdataset,
query_addadditional,
client);
}
cleanup:
CTRACE("query_addadditional: cleanup");
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
CTRACE("query_addadditional: done");
return (eresult);
}
static inline void
query_discardcache(ns_client_t *client, dns_rdataset_t *rdataset_base,
dns_rdatasetadditional_t additionaltype,
dns_rdatatype_t type, dns_zone_t **zonep, dns_db_t **dbp,
dns_dbversion_t **versionp, dns_dbnode_t **nodep,
dns_name_t *fname)
{
dns_rdataset_t *rdataset;
while ((rdataset = ISC_LIST_HEAD(fname->list)) != NULL) {
ISC_LIST_UNLINK(fname->list, rdataset, link);
query_putrdataset(client, &rdataset);
}
if (*versionp != NULL)
dns_db_closeversion(*dbp, versionp, ISC_FALSE);
if (*nodep != NULL)
dns_db_detachnode(*dbp, nodep);
if (*dbp != NULL)
dns_db_detach(dbp);
if (*zonep != NULL)
dns_zone_detach(zonep);
(void)dns_rdataset_putadditional(client->view->acache, rdataset_base,
additionaltype, type);
}
static inline isc_result_t
query_iscachevalid(dns_zone_t *zone, dns_db_t *db, dns_db_t *db0,
dns_dbversion_t *version)
{
isc_result_t result = ISC_R_SUCCESS;
dns_dbversion_t *version_current = NULL;
dns_db_t *db_current = db0;
if (db_current == NULL) {
result = dns_zone_getdb(zone, &db_current);
if (result != ISC_R_SUCCESS)
return (result);
}
dns_db_currentversion(db_current, &version_current);
if (db_current != db || version_current != version) {
result = ISC_R_FAILURE;
goto cleanup;
}
cleanup:
dns_db_closeversion(db_current, &version_current, ISC_FALSE);
if (db0 == NULL && db_current != NULL)
dns_db_detach(&db_current);
return (result);
}
static isc_result_t
query_addadditional2(void *arg, dns_name_t *name, dns_rdatatype_t qtype) {
client_additionalctx_t *additionalctx = arg;
dns_rdataset_t *rdataset_base;
ns_client_t *client;
isc_result_t result, eresult;
dns_dbnode_t *node, *cnode;
dns_db_t *db, *cdb;
dns_name_t *fname, *mname0, cfname;
dns_rdataset_t *rdataset, *sigrdataset;
dns_rdataset_t *crdataset, *crdataset_next;
isc_buffer_t *dbuf;
isc_buffer_t b;
dns_dbversion_t *version, *cversion;
isc_boolean_t added_something, need_addname, needadditionalcache;
isc_boolean_t need_sigrrset;
dns_zone_t *zone;
dns_rdatatype_t type;
dns_rdatasetadditional_t additionaltype;
if (qtype != dns_rdatatype_a) {
/*
* This function is optimized for "address" types. For other
* types, use a generic routine.
* XXX: ideally, this function should be generic enough.
*/
return (query_addadditional(additionalctx->client,
name, qtype));
}
/*
* Initialization.
*/
rdataset_base = additionalctx->rdataset;
client = additionalctx->client;
REQUIRE(NS_CLIENT_VALID(client));
eresult = ISC_R_SUCCESS;
fname = NULL;
rdataset = NULL;
sigrdataset = NULL;
db = NULL;
cdb = NULL;
version = NULL;
cversion = NULL;
node = NULL;
cnode = NULL;
added_something = ISC_FALSE;
need_addname = ISC_FALSE;
zone = NULL;
needadditionalcache = ISC_FALSE;
POST(needadditionalcache);
additionaltype = dns_rdatasetadditional_fromauth;
dns_name_init(&cfname, NULL);
CTRACE("query_addadditional2");
/*
* We treat type A additional section processing as if it
* were "any address type" additional section processing.
* To avoid multiple lookups, we do an 'any' database
* lookup and iterate over the node.
* XXXJT: this approach can cause a suboptimal result when the cache
* DB only has partial address types and the glue DB has remaining
* ones.
*/
type = dns_rdatatype_any;
/*
* Get some resources.
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
if (fname == NULL)
goto cleanup;
dns_name_setbuffer(&cfname, &b); /* share the buffer */
/* Check additional cache */
result = dns_rdataset_getadditional(rdataset_base, additionaltype,
type, client->view->acache, &zone,
&cdb, &cversion, &cnode, &cfname,
client->message, client->now);
if (result != ISC_R_SUCCESS)
goto findauthdb;
if (zone == NULL) {
CTRACE("query_addadditional2: auth zone not found");
goto try_cache;
}
/* Is the cached DB up-to-date? */
result = query_iscachevalid(zone, cdb, NULL, cversion);
if (result != ISC_R_SUCCESS) {
CTRACE("query_addadditional2: old auth additional cache");
query_discardcache(client, rdataset_base, additionaltype,
type, &zone, &cdb, &cversion, &cnode,
&cfname);
goto findauthdb;
}
if (cnode == NULL) {
/*
* We have a negative cache. We don't have to check the zone
* ACL, since the result (not using this zone) would be same
* regardless of the result.
*/
CTRACE("query_addadditional2: negative auth additional cache");
dns_db_closeversion(cdb, &cversion, ISC_FALSE);
dns_db_detach(&cdb);
dns_zone_detach(&zone);
goto try_cache;
}
result = query_validatezonedb(client, name, qtype, DNS_GETDB_NOLOG,
zone, cdb, NULL);
if (result != ISC_R_SUCCESS) {
query_discardcache(client, rdataset_base, additionaltype,
type, &zone, &cdb, &cversion, &cnode,
&cfname);
goto try_cache;
}
/* We've got an active cache. */
CTRACE("query_addadditional2: auth additional cache");
dns_db_closeversion(cdb, &cversion, ISC_FALSE);
db = cdb;
node = cnode;
dns_name_clone(&cfname, fname);
query_keepname(client, fname, dbuf);
goto foundcache;
/*
* Look for a zone database that might contain authoritative
* additional data.
*/
findauthdb:
result = query_getzonedb(client, name, qtype, DNS_GETDB_NOLOG,
&zone, &db, &version);
if (result != ISC_R_SUCCESS) {
/* Cache the negative result */
(void)dns_rdataset_setadditional(rdataset_base, additionaltype,
type, client->view->acache,
NULL, NULL, NULL, NULL,
NULL);
goto try_cache;
}
CTRACE("query_addadditional2: db_find");
/*
* Since we are looking for authoritative data, we do not set
* the GLUEOK flag. Glue will be looked for later, but not
* necessarily in the same database.
*/
node = NULL;
result = dns_db_find(db, name, version, type, client->query.dboptions,
client->now, &node, fname, NULL, NULL);
if (result == ISC_R_SUCCESS)
goto found;
/* Cache the negative result */
(void)dns_rdataset_setadditional(rdataset_base, additionaltype,
type, client->view->acache, zone, db,
version, NULL, fname);
if (node != NULL)
dns_db_detachnode(db, &node);
version = NULL;
dns_db_detach(&db);
/*
* No authoritative data was found. The cache is our next best bet.
*/
try_cache:
additionaltype = dns_rdatasetadditional_fromcache;
result = query_getcachedb(client, name, qtype, &db, DNS_GETDB_NOLOG);
if (result != ISC_R_SUCCESS)
/*
* Most likely the client isn't allowed to query the cache.
*/
goto try_glue;
result = dns_db_find(db, name, version, type,
client->query.dboptions |
DNS_DBFIND_GLUEOK | DNS_DBFIND_ADDITIONALOK,
client->now, &node, fname, NULL, NULL);
if (result == ISC_R_SUCCESS)
goto found;
if (node != NULL)
dns_db_detachnode(db, &node);
dns_db_detach(&db);
try_glue:
/*
* No cached data was found. Glue is our last chance.
* RFC1035 sayeth:
*
* NS records cause both the usual additional section
* processing to locate a type A record, and, when used
* in a referral, a special search of the zone in which
* they reside for glue information.
*
* This is the "special search". Note that we must search
* the zone where the NS record resides, not the zone it
* points to, and that we only do the search in the delegation
* case (identified by client->query.gluedb being set).
*/
if (client->query.gluedb == NULL)
goto cleanup;
/*
* Don't poison caches using the bailiwick protection model.
*/
if (!dns_name_issubdomain(name, dns_db_origin(client->query.gluedb)))
goto cleanup;
/* Check additional cache */
additionaltype = dns_rdatasetadditional_fromglue;
result = dns_rdataset_getadditional(rdataset_base, additionaltype,
type, client->view->acache, NULL,
&cdb, &cversion, &cnode, &cfname,
client->message, client->now);
if (result != ISC_R_SUCCESS)
goto findglue;
result = query_iscachevalid(zone, cdb, client->query.gluedb, cversion);
if (result != ISC_R_SUCCESS) {
CTRACE("query_addadditional2: old glue additional cache");
query_discardcache(client, rdataset_base, additionaltype,
type, &zone, &cdb, &cversion, &cnode,
&cfname);
goto findglue;
}
if (cnode == NULL) {
/* We have a negative cache. */
CTRACE("query_addadditional2: negative glue additional cache");
dns_db_closeversion(cdb, &cversion, ISC_FALSE);
dns_db_detach(&cdb);
goto cleanup;
}
/* Cache hit. */
CTRACE("query_addadditional2: glue additional cache");
dns_db_closeversion(cdb, &cversion, ISC_FALSE);
db = cdb;
node = cnode;
dns_name_clone(&cfname, fname);
query_keepname(client, fname, dbuf);
goto foundcache;
findglue:
dns_db_attach(client->query.gluedb, &db);
result = dns_db_find(db, name, version, type,
client->query.dboptions | DNS_DBFIND_GLUEOK,
client->now, &node, fname, NULL, NULL);
if (!(result == ISC_R_SUCCESS ||
result == DNS_R_ZONECUT ||
result == DNS_R_GLUE)) {
/* cache the negative result */
(void)dns_rdataset_setadditional(rdataset_base, additionaltype,
type, client->view->acache,
NULL, db, version, NULL,
fname);
goto cleanup;
}
found:
/*
* We have found a DB node to iterate over from a DB.
* We are going to look for address RRsets (i.e., A and AAAA) in the DB
* node we've just found. We'll then store the complete information
* in the additional data cache.
*/
dns_name_clone(fname, &cfname);
query_keepname(client, fname, dbuf);
needadditionalcache = ISC_TRUE;
rdataset = query_newrdataset(client);
if (rdataset == NULL)
goto cleanup;
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto cleanup;
/*
* Find A RRset with sig RRset. Even if we don't find a sig RRset
* for a client using DNSSEC, we'll continue the process to make a
* complete list to be cached. However, we need to cancel the
* caching when something unexpected happens, in order to avoid
* caching incomplete information.
*/
result = dns_db_findrdataset(db, node, version, dns_rdatatype_a, 0,
client->now, rdataset, sigrdataset);
/*
* If we can't promote glue/pending from the cache to secure
* then drop it.
*/
if (result == ISC_R_SUCCESS &&
additionaltype == dns_rdatasetadditional_fromcache &&
(DNS_TRUST_PENDING(rdataset->trust) ||
DNS_TRUST_GLUE(rdataset->trust)) &&
!validate(client, db, fname, rdataset, sigrdataset)) {
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
result = ISC_R_NOTFOUND;
}
if (result == DNS_R_NCACHENXDOMAIN)
goto setcache;
if (result == DNS_R_NCACHENXRRSET) {
dns_rdataset_disassociate(rdataset);
/*
* Negative cache entries don't have sigrdatasets.
*/
INSIST(! dns_rdataset_isassociated(sigrdataset));
}
if (result == ISC_R_SUCCESS) {
/* Remember the result as a cache */
ISC_LIST_APPEND(cfname.list, rdataset, link);
if (dns_rdataset_isassociated(sigrdataset)) {
ISC_LIST_APPEND(cfname.list, sigrdataset, link);
sigrdataset = query_newrdataset(client);
}
rdataset = query_newrdataset(client);
if (sigrdataset == NULL || rdataset == NULL) {
/* do not cache incomplete information */
goto foundcache;
}
}
/* Find AAAA RRset with sig RRset */
result = dns_db_findrdataset(db, node, version, dns_rdatatype_aaaa,
0, client->now, rdataset, sigrdataset);
/*
* If we can't promote glue/pending from the cache to secure
* then drop it.
*/
if (result == ISC_R_SUCCESS &&
additionaltype == dns_rdatasetadditional_fromcache &&
(DNS_TRUST_PENDING(rdataset->trust) ||
DNS_TRUST_GLUE(rdataset->trust)) &&
!validate(client, db, fname, rdataset, sigrdataset)) {
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
result = ISC_R_NOTFOUND;
}
if (result == ISC_R_SUCCESS) {
ISC_LIST_APPEND(cfname.list, rdataset, link);
rdataset = NULL;
if (dns_rdataset_isassociated(sigrdataset)) {
ISC_LIST_APPEND(cfname.list, sigrdataset, link);
sigrdataset = NULL;
}
}
setcache:
/*
* Set the new result in the cache if required. We do not support
* caching additional data from a cache DB.
*/
if (needadditionalcache == ISC_TRUE &&
(additionaltype == dns_rdatasetadditional_fromauth ||
additionaltype == dns_rdatasetadditional_fromglue)) {
(void)dns_rdataset_setadditional(rdataset_base, additionaltype,
type, client->view->acache,
zone, db, version, node,
&cfname);
}
foundcache:
need_sigrrset = ISC_FALSE;
mname0 = NULL;
for (crdataset = ISC_LIST_HEAD(cfname.list);
crdataset != NULL;
crdataset = crdataset_next) {
dns_name_t *mname;
crdataset_next = ISC_LIST_NEXT(crdataset, link);
mname = NULL;
if (crdataset->type == dns_rdatatype_a ||
crdataset->type == dns_rdatatype_aaaa) {
if (!query_isduplicate(client, fname, crdataset->type,
&mname)) {
if (mname != NULL) {
/*
* A different type of this name is
* already stored in the additional
* section. We'll reuse the name.
* Note that this should happen at most
* once. Otherwise, fname->link could
* leak below.
*/
INSIST(mname0 == NULL);
query_releasename(client, &fname);
fname = mname;
mname0 = mname;
} else
need_addname = ISC_TRUE;
ISC_LIST_UNLINK(cfname.list, crdataset, link);
ISC_LIST_APPEND(fname->list, crdataset, link);
added_something = ISC_TRUE;
need_sigrrset = ISC_TRUE;
} else
need_sigrrset = ISC_FALSE;
} else if (crdataset->type == dns_rdatatype_rrsig &&
need_sigrrset && WANTDNSSEC(client)) {
ISC_LIST_UNLINK(cfname.list, crdataset, link);
ISC_LIST_APPEND(fname->list, crdataset, link);
added_something = ISC_TRUE; /* just in case */
need_sigrrset = ISC_FALSE;
}
}
CTRACE("query_addadditional2: addname");
/*
* If we haven't added anything, then we're done.
*/
if (!added_something)
goto cleanup;
/*
* We may have added our rdatasets to an existing name, if so, then
* need_addname will be ISC_FALSE. Whether we used an existing name
* or a new one, we must set fname to NULL to prevent cleanup.
*/
if (need_addname)
dns_message_addname(client->message, fname,
DNS_SECTION_ADDITIONAL);
fname = NULL;
cleanup:
CTRACE("query_addadditional2: cleanup");
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
while ((crdataset = ISC_LIST_HEAD(cfname.list)) != NULL) {
ISC_LIST_UNLINK(cfname.list, crdataset, link);
query_putrdataset(client, &crdataset);
}
if (fname != NULL)
query_releasename(client, &fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
CTRACE("query_addadditional2: done");
return (eresult);
}
static inline void
query_addrdataset(ns_client_t *client, dns_name_t *fname,
dns_rdataset_t *rdataset)
{
client_additionalctx_t additionalctx;
/*
* Add 'rdataset' and any pertinent additional data to
* 'fname', a name in the response message for 'client'.
*/
CTRACE("query_addrdataset");
ISC_LIST_APPEND(fname->list, rdataset, link);
if (client->view->order != NULL)
rdataset->attributes |= dns_order_find(client->view->order,
fname, rdataset->type,
rdataset->rdclass);
rdataset->attributes |= DNS_RDATASETATTR_LOADORDER;
if (NOADDITIONAL(client))
return;
/*
* Add additional data.
*
* We don't care if dns_rdataset_additionaldata() fails.
*/
additionalctx.client = client;
additionalctx.rdataset = rdataset;
(void)dns_rdataset_additionaldata(rdataset, query_addadditional2,
&additionalctx);
CTRACE("query_addrdataset: done");
}
static isc_result_t
query_dns64(ns_client_t *client, dns_name_t **namep, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset, isc_buffer_t *dbuf,
dns_section_t section)
{
dns_name_t *name, *mname;
dns_rdata_t *dns64_rdata;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdatalist_t *dns64_rdatalist;
dns_rdataset_t *dns64_rdataset;
dns_rdataset_t *mrdataset;
isc_buffer_t *buffer;
isc_region_t r;
isc_result_t result;
dns_view_t *view = client->view;
isc_netaddr_t netaddr;
dns_dns64_t *dns64;
unsigned int flags = 0;
/*%
* To the current response for 'client', add the answer RRset
* '*rdatasetp' and an optional signature set '*sigrdatasetp', with
* owner name '*namep', to section 'section', unless they are
* already there. Also add any pertinent additional data.
*
* If 'dbuf' is not NULL, then '*namep' is the name whose data is
* stored in 'dbuf'. In this case, query_addrrset() guarantees that
* when it returns the name will either have been kept or released.
*/
CTRACE("query_dns64");
name = *namep;
mname = NULL;
mrdataset = NULL;
buffer = NULL;
dns64_rdata = NULL;
dns64_rdataset = NULL;
dns64_rdatalist = NULL;
result = dns_message_findname(client->message, section,
name, dns_rdatatype_aaaa,
rdataset->covers,
&mname, &mrdataset);
if (result == ISC_R_SUCCESS) {
/*
* We've already got an RRset of the given name and type.
* There's nothing else to do;
*/
CTRACE("query_dns64: dns_message_findname succeeded: done");
if (dbuf != NULL)
query_releasename(client, namep);
return (ISC_R_SUCCESS);
} else if (result == DNS_R_NXDOMAIN) {
/*
* The name doesn't exist.
*/
if (dbuf != NULL)
query_keepname(client, name, dbuf);
dns_message_addname(client->message, name, section);
*namep = NULL;
mname = name;
} else {
RUNTIME_CHECK(result == DNS_R_NXRRSET);
if (dbuf != NULL)
query_releasename(client, namep);
}
if (rdataset->trust != dns_trust_secure &&
(section == DNS_SECTION_ANSWER ||
section == DNS_SECTION_AUTHORITY))
client->query.attributes &= ~NS_QUERYATTR_SECURE;
isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
result = isc_buffer_allocate(client->mctx, &buffer, view->dns64cnt *
16 * dns_rdataset_count(rdataset));
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdataset(client->message, &dns64_rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdatalist(client->message,
&dns64_rdatalist);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdataset_init(dns64_rdataset);
dns_rdatalist_init(dns64_rdatalist);
dns64_rdatalist->rdclass = dns_rdataclass_in;
dns64_rdatalist->type = dns_rdatatype_aaaa;
if (client->query.dns64_ttl != ISC_UINT32_MAX)
dns64_rdatalist->ttl = ISC_MIN(rdataset->ttl,
client->query.dns64_ttl);
else
dns64_rdatalist->ttl = ISC_MIN(rdataset->ttl, 600);
if (RECURSIONOK(client))
flags |= DNS_DNS64_RECURSIVE;
/*
* We use the signatures from the A lookup to set DNS_DNS64_DNSSEC
* as this provides a easy way to see if the answer was signed.
*/
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
flags |= DNS_DNS64_DNSSEC;
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
for (dns64 = ISC_LIST_HEAD(client->view->dns64);
dns64 != NULL; dns64 = dns_dns64_next(dns64)) {
dns_rdataset_current(rdataset, &rdata);
isc__buffer_availableregion(buffer, &r);
INSIST(r.length >= 16);
result = dns_dns64_aaaafroma(dns64, &netaddr,
client->signer,
&ns_g_server->aclenv,
flags, rdata.data, r.base);
if (result != ISC_R_SUCCESS) {
dns_rdata_reset(&rdata);
continue;
}
isc_buffer_add(buffer, 16);
isc_buffer_remainingregion(buffer, &r);
isc_buffer_forward(buffer, 16);
result = dns_message_gettemprdata(client->message,
&dns64_rdata);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdata_init(dns64_rdata);
dns_rdata_fromregion(dns64_rdata, dns_rdataclass_in,
dns_rdatatype_aaaa, &r);
ISC_LIST_APPEND(dns64_rdatalist->rdata, dns64_rdata,
link);
dns64_rdata = NULL;
dns_rdata_reset(&rdata);
}
}
if (result != ISC_R_NOMORE)
goto cleanup;
if (ISC_LIST_EMPTY(dns64_rdatalist->rdata))
goto cleanup;
result = dns_rdatalist_tordataset(dns64_rdatalist, dns64_rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
client->query.attributes |= NS_QUERYATTR_NOADDITIONAL;
dns64_rdataset->trust = rdataset->trust;
query_addrdataset(client, mname, dns64_rdataset);
dns64_rdataset = NULL;
dns64_rdatalist = NULL;
dns_message_takebuffer(client->message, &buffer);
result = ISC_R_SUCCESS;
cleanup:
if (buffer != NULL)
isc_buffer_free(&buffer);
if (dns64_rdata != NULL)
dns_message_puttemprdata(client->message, &dns64_rdata);
if (dns64_rdataset != NULL)
dns_message_puttemprdataset(client->message, &dns64_rdataset);
if (dns64_rdatalist != NULL) {
for (dns64_rdata = ISC_LIST_HEAD(dns64_rdatalist->rdata);
dns64_rdata != NULL;
dns64_rdata = ISC_LIST_HEAD(dns64_rdatalist->rdata))
{
ISC_LIST_UNLINK(dns64_rdatalist->rdata,
dns64_rdata, link);
dns_message_puttemprdata(client->message, &dns64_rdata);
}
dns_message_puttemprdatalist(client->message, &dns64_rdatalist);
}
CTRACE("query_dns64: done");
return (result);
}
static void
query_filter64(ns_client_t *client, dns_name_t **namep,
dns_rdataset_t *rdataset, isc_buffer_t *dbuf,
dns_section_t section)
{
dns_name_t *name, *mname;
dns_rdata_t *myrdata;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdatalist_t *myrdatalist;
dns_rdataset_t *myrdataset;
isc_buffer_t *buffer;
isc_region_t r;
isc_result_t result;
unsigned int i;
CTRACE("query_filter64");
INSIST(client->query.dns64_aaaaok != NULL);
INSIST(client->query.dns64_aaaaoklen == dns_rdataset_count(rdataset));
name = *namep;
mname = NULL;
buffer = NULL;
myrdata = NULL;
myrdataset = NULL;
myrdatalist = NULL;
result = dns_message_findname(client->message, section,
name, dns_rdatatype_aaaa,
rdataset->covers,
&mname, &myrdataset);
if (result == ISC_R_SUCCESS) {
/*
* We've already got an RRset of the given name and type.
* There's nothing else to do;
*/
CTRACE("query_filter64: dns_message_findname succeeded: done");
if (dbuf != NULL)
query_releasename(client, namep);
return;
} else if (result == DNS_R_NXDOMAIN) {
mname = name;
*namep = NULL;
} else {
RUNTIME_CHECK(result == DNS_R_NXRRSET);
if (dbuf != NULL)
query_releasename(client, namep);
dbuf = NULL;
}
if (rdataset->trust != dns_trust_secure &&
(section == DNS_SECTION_ANSWER ||
section == DNS_SECTION_AUTHORITY))
client->query.attributes &= ~NS_QUERYATTR_SECURE;
result = isc_buffer_allocate(client->mctx, &buffer,
16 * dns_rdataset_count(rdataset));
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdataset(client->message, &myrdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdatalist(client->message, &myrdatalist);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdataset_init(myrdataset);
dns_rdatalist_init(myrdatalist);
myrdatalist->rdclass = dns_rdataclass_in;
myrdatalist->type = dns_rdatatype_aaaa;
myrdatalist->ttl = rdataset->ttl;
i = 0;
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
if (!client->query.dns64_aaaaok[i++])
continue;
dns_rdataset_current(rdataset, &rdata);
INSIST(rdata.length == 16);
isc_buffer_putmem(buffer, rdata.data, rdata.length);
isc_buffer_remainingregion(buffer, &r);
isc_buffer_forward(buffer, rdata.length);
result = dns_message_gettemprdata(client->message, &myrdata);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdata_init(myrdata);
dns_rdata_fromregion(myrdata, dns_rdataclass_in,
dns_rdatatype_aaaa, &r);
ISC_LIST_APPEND(myrdatalist->rdata, myrdata, link);
myrdata = NULL;
dns_rdata_reset(&rdata);
}
if (result != ISC_R_NOMORE)
goto cleanup;
result = dns_rdatalist_tordataset(myrdatalist, myrdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
client->query.attributes |= NS_QUERYATTR_NOADDITIONAL;
if (mname == name) {
if (dbuf != NULL)
query_keepname(client, name, dbuf);
dns_message_addname(client->message, name, section);
dbuf = NULL;
}
myrdataset->trust = rdataset->trust;
query_addrdataset(client, mname, myrdataset);
myrdataset = NULL;
myrdatalist = NULL;
dns_message_takebuffer(client->message, &buffer);
cleanup:
if (buffer != NULL)
isc_buffer_free(&buffer);
if (myrdata != NULL)
dns_message_puttemprdata(client->message, &myrdata);
if (myrdataset != NULL)
dns_message_puttemprdataset(client->message, &myrdataset);
if (myrdatalist != NULL) {
for (myrdata = ISC_LIST_HEAD(myrdatalist->rdata);
myrdata != NULL;
myrdata = ISC_LIST_HEAD(myrdatalist->rdata))
{
ISC_LIST_UNLINK(myrdatalist->rdata, myrdata, link);
dns_message_puttemprdata(client->message, &myrdata);
}
dns_message_puttemprdatalist(client->message, &myrdatalist);
}
if (dbuf != NULL)
query_releasename(client, &name);
CTRACE("query_filter64: done");
}
static void
query_addrrset(ns_client_t *client, dns_name_t **namep,
dns_rdataset_t **rdatasetp, dns_rdataset_t **sigrdatasetp,
isc_buffer_t *dbuf, dns_section_t section)
{
dns_name_t *name, *mname;
dns_rdataset_t *rdataset, *mrdataset, *sigrdataset;
isc_result_t result;
/*%
* To the current response for 'client', add the answer RRset
* '*rdatasetp' and an optional signature set '*sigrdatasetp', with
* owner name '*namep', to section 'section', unless they are
* already there. Also add any pertinent additional data.
*
* If 'dbuf' is not NULL, then '*namep' is the name whose data is
* stored in 'dbuf'. In this case, query_addrrset() guarantees that
* when it returns the name will either have been kept or released.
*/
CTRACE("query_addrrset");
name = *namep;
rdataset = *rdatasetp;
if (sigrdatasetp != NULL)
sigrdataset = *sigrdatasetp;
else
sigrdataset = NULL;
mname = NULL;
mrdataset = NULL;
result = dns_message_findname(client->message, section,
name, rdataset->type, rdataset->covers,
&mname, &mrdataset);
if (result == ISC_R_SUCCESS) {
/*
* We've already got an RRset of the given name and type.
* There's nothing else to do;
*/
CTRACE("query_addrrset: dns_message_findname succeeded: done");
if (dbuf != NULL)
query_releasename(client, namep);
return;
} else if (result == DNS_R_NXDOMAIN) {
/*
* The name doesn't exist.
*/
if (dbuf != NULL)
query_keepname(client, name, dbuf);
dns_message_addname(client->message, name, section);
*namep = NULL;
mname = name;
} else {
RUNTIME_CHECK(result == DNS_R_NXRRSET);
if (dbuf != NULL)
query_releasename(client, namep);
}
if (rdataset->trust != dns_trust_secure &&
(section == DNS_SECTION_ANSWER ||
section == DNS_SECTION_AUTHORITY))
client->query.attributes &= ~NS_QUERYATTR_SECURE;
/*
* Note: we only add SIGs if we've added the type they cover, so
* we do not need to check if the SIG rdataset is already in the
* response.
*/
query_addrdataset(client, mname, rdataset);
*rdatasetp = NULL;
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset)) {
/*
* We have a signature. Add it to the response.
*/
ISC_LIST_APPEND(mname->list, sigrdataset, link);
*sigrdatasetp = NULL;
}
CTRACE("query_addrrset: done");
}
static inline isc_result_t
query_addsoa(ns_client_t *client, dns_db_t *db, dns_dbversion_t *version,
unsigned int override_ttl, isc_boolean_t isassociated)
{
dns_name_t *name;
dns_dbnode_t *node;
isc_result_t result, eresult;
dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
dns_rdataset_t **sigrdatasetp = NULL;
CTRACE("query_addsoa");
/*
* Initialization.
*/
eresult = ISC_R_SUCCESS;
name = NULL;
rdataset = NULL;
node = NULL;
/*
* Don't add the SOA record for test which set "-T nosoa".
*/
if (ns_g_nosoa && (!WANTDNSSEC(client) || !isassociated))
return (ISC_R_SUCCESS);
/*
* Get resources and make 'name' be the database origin.
*/
result = dns_message_gettempname(client->message, &name);
if (result != ISC_R_SUCCESS)
return (result);
dns_name_init(name, NULL);
dns_name_clone(dns_db_origin(db), name);
rdataset = query_newrdataset(client);
if (rdataset == NULL) {
eresult = DNS_R_SERVFAIL;
goto cleanup;
}
if (WANTDNSSEC(client) && dns_db_issecure(db)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL) {
eresult = DNS_R_SERVFAIL;
goto cleanup;
}
}
/*
* Find the SOA.
*/
result = dns_db_getoriginnode(db, &node);
if (result == ISC_R_SUCCESS) {
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_soa,
0, client->now, rdataset,
sigrdataset);
} else {
dns_fixedname_t foundname;
dns_name_t *fname;
dns_fixedname_init(&foundname);
fname = dns_fixedname_name(&foundname);
result = dns_db_find(db, name, version, dns_rdatatype_soa,
client->query.dboptions, 0, &node,
fname, rdataset, sigrdataset);
}
if (result != ISC_R_SUCCESS) {
/*
* This is bad. We tried to get the SOA RR at the zone top
* and it didn't work!
*/
eresult = DNS_R_SERVFAIL;
} else {
/*
* Extract the SOA MINIMUM.
*/
dns_rdata_soa_t soa;
dns_rdata_t rdata = DNS_RDATA_INIT;
result = dns_rdataset_first(rdataset);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup;
if (override_ttl != ISC_UINT32_MAX &&
override_ttl < rdataset->ttl) {
rdataset->ttl = override_ttl;
if (sigrdataset != NULL)
sigrdataset->ttl = override_ttl;
}
/*
* Add the SOA and its SIG to the response, with the
* TTLs adjusted per RFC2308 section 3.
*/
if (rdataset->ttl > soa.minimum)
rdataset->ttl = soa.minimum;
if (sigrdataset != NULL && sigrdataset->ttl > soa.minimum)
sigrdataset->ttl = soa.minimum;
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
query_addrrset(client, &name, &rdataset, sigrdatasetp, NULL,
DNS_SECTION_AUTHORITY);
}
cleanup:
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (name != NULL)
query_releasename(client, &name);
if (node != NULL)
dns_db_detachnode(db, &node);
return (eresult);
}
static inline isc_result_t
query_addns(ns_client_t *client, dns_db_t *db, dns_dbversion_t *version) {
dns_name_t *name, *fname;
dns_dbnode_t *node;
isc_result_t result, eresult;
dns_fixedname_t foundname;
dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
dns_rdataset_t **sigrdatasetp = NULL;
CTRACE("query_addns");
/*
* Initialization.
*/
eresult = ISC_R_SUCCESS;
name = NULL;
rdataset = NULL;
node = NULL;
dns_fixedname_init(&foundname);
fname = dns_fixedname_name(&foundname);
/*
* Get resources and make 'name' be the database origin.
*/
result = dns_message_gettempname(client->message, &name);
if (result != ISC_R_SUCCESS) {
CTRACE("query_addns: dns_message_gettempname failed: done");
return (result);
}
dns_name_init(name, NULL);
dns_name_clone(dns_db_origin(db), name);
rdataset = query_newrdataset(client);
if (rdataset == NULL) {
CTRACE("query_addns: query_newrdataset failed");
eresult = DNS_R_SERVFAIL;
goto cleanup;
}
if (WANTDNSSEC(client) && dns_db_issecure(db)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL) {
CTRACE("query_addns: query_newrdataset failed");
eresult = DNS_R_SERVFAIL;
goto cleanup;
}
}
/*
* Find the NS rdataset.
*/
result = dns_db_getoriginnode(db, &node);
if (result == ISC_R_SUCCESS) {
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_ns,
0, client->now, rdataset,
sigrdataset);
} else {
CTRACE("query_addns: calling dns_db_find");
result = dns_db_find(db, name, NULL, dns_rdatatype_ns,
client->query.dboptions, 0, &node,
fname, rdataset, sigrdataset);
CTRACE("query_addns: dns_db_find complete");
}
if (result != ISC_R_SUCCESS) {
CTRACE("query_addns: "
"dns_db_findrdataset or dns_db_find failed");
/*
* This is bad. We tried to get the NS rdataset at the zone
* top and it didn't work!
*/
eresult = DNS_R_SERVFAIL;
} else {
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
query_addrrset(client, &name, &rdataset, sigrdatasetp, NULL,
DNS_SECTION_AUTHORITY);
}
cleanup:
CTRACE("query_addns: cleanup");
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (name != NULL)
query_releasename(client, &name);
if (node != NULL)
dns_db_detachnode(db, &node);
CTRACE("query_addns: done");
return (eresult);
}
static isc_result_t
query_add_cname(ns_client_t *client, dns_name_t *qname, dns_name_t *tname,
dns_trust_t trust, dns_ttl_t ttl)
{
dns_rdataset_t *rdataset;
dns_rdatalist_t *rdatalist;
dns_rdata_t *rdata;
isc_region_t r;
dns_name_t *aname;
isc_result_t result;
/*
* We assume the name data referred to by tname won't go away.
*/
aname = NULL;
result = dns_message_gettempname(client->message, &aname);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_name_dup(qname, client->mctx, aname);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
return (result);
}
rdatalist = NULL;
result = dns_message_gettemprdatalist(client->message, &rdatalist);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
return (result);
}
rdata = NULL;
result = dns_message_gettemprdata(client->message, &rdata);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
dns_message_puttemprdatalist(client->message, &rdatalist);
return (result);
}
rdataset = NULL;
result = dns_message_gettemprdataset(client->message, &rdataset);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
dns_message_puttemprdatalist(client->message, &rdatalist);
dns_message_puttemprdata(client->message, &rdata);
return (result);
}
dns_rdataset_init(rdataset);
rdatalist->type = dns_rdatatype_cname;
rdatalist->covers = 0;
rdatalist->rdclass = client->message->rdclass;
rdatalist->ttl = ttl;
dns_name_toregion(tname, &r);
rdata->data = r.base;
rdata->length = r.length;
rdata->rdclass = client->message->rdclass;
rdata->type = dns_rdatatype_cname;
ISC_LIST_INIT(rdatalist->rdata);
ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist, rdataset)
== ISC_R_SUCCESS);
rdataset->trust = trust;
query_addrrset(client, &aname, &rdataset, NULL, NULL,
DNS_SECTION_ANSWER);
if (rdataset != NULL) {
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
dns_message_puttemprdataset(client->message, &rdataset);
}
if (aname != NULL)
dns_message_puttempname(client->message, &aname);
return (ISC_R_SUCCESS);
}
/*
* Mark the RRsets as secure. Update the cache (db) to reflect the
* change in trust level.
*/
static void
mark_secure(ns_client_t *client, dns_db_t *db, dns_name_t *name,
isc_uint32_t ttl, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
rdataset->trust = dns_trust_secure;
sigrdataset->trust = dns_trust_secure;
/*
* Save the updated secure state. Ignore failures.
*/
result = dns_db_findnode(db, name, ISC_TRUE, &node);
if (result != ISC_R_SUCCESS)
return;
/*
* Bound the validated ttls then minimise.
*/
if (sigrdataset->ttl > ttl)
sigrdataset->ttl = ttl;
if (rdataset->ttl > ttl)
rdataset->ttl = ttl;
if (rdataset->ttl > sigrdataset->ttl)
rdataset->ttl = sigrdataset->ttl;
else
sigrdataset->ttl = rdataset->ttl;
(void)dns_db_addrdataset(db, node, NULL, client->now, rdataset,
0, NULL);
(void)dns_db_addrdataset(db, node, NULL, client->now, sigrdataset,
0, NULL);
dns_db_detachnode(db, &node);
}
/*
* Find the secure key that corresponds to rrsig.
* Note: 'keyrdataset' maintains state between successive calls,
* there may be multiple keys with the same keyid.
* Return ISC_FALSE if we have exhausted all the possible keys.
*/
static isc_boolean_t
get_key(ns_client_t *client, dns_db_t *db, dns_rdata_rrsig_t *rrsig,
dns_rdataset_t *keyrdataset, dst_key_t **keyp)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
isc_boolean_t secure = ISC_FALSE;
if (!dns_rdataset_isassociated(keyrdataset)) {
result = dns_db_findnode(db, &rrsig->signer, ISC_FALSE, &node);
if (result != ISC_R_SUCCESS)
return (ISC_FALSE);
result = dns_db_findrdataset(db, node, NULL,
dns_rdatatype_dnskey, 0,
client->now, keyrdataset, NULL);
dns_db_detachnode(db, &node);
if (result != ISC_R_SUCCESS)
return (ISC_FALSE);
if (keyrdataset->trust != dns_trust_secure)
return (ISC_FALSE);
result = dns_rdataset_first(keyrdataset);
} else
result = dns_rdataset_next(keyrdataset);
for ( ; result == ISC_R_SUCCESS;
result = dns_rdataset_next(keyrdataset)) {
dns_rdata_t rdata = DNS_RDATA_INIT;
isc_buffer_t b;
dns_rdataset_current(keyrdataset, &rdata);
isc_buffer_init(&b, rdata.data, rdata.length);
isc_buffer_add(&b, rdata.length);
result = dst_key_fromdns(&rrsig->signer, rdata.rdclass, &b,
client->mctx, keyp);
if (result != ISC_R_SUCCESS)
continue;
if (rrsig->algorithm == (dns_secalg_t)dst_key_alg(*keyp) &&
rrsig->keyid == (dns_keytag_t)dst_key_id(*keyp) &&
dst_key_iszonekey(*keyp)) {
secure = ISC_TRUE;
break;
}
dst_key_free(keyp);
}
return (secure);
}
static isc_boolean_t
verify(dst_key_t *key, dns_name_t *name, dns_rdataset_t *rdataset,
dns_rdata_t *rdata, isc_mem_t *mctx, isc_boolean_t acceptexpired)
{
isc_result_t result;
dns_fixedname_t fixed;
isc_boolean_t ignore = ISC_FALSE;
dns_fixedname_init(&fixed);
again:
result = dns_dnssec_verify2(name, rdataset, key, ignore, mctx,
rdata, NULL);
if (result == DNS_R_SIGEXPIRED && acceptexpired) {
ignore = ISC_TRUE;
goto again;
}
if (result == ISC_R_SUCCESS || result == DNS_R_FROMWILDCARD)
return (ISC_TRUE);
return (ISC_FALSE);
}
/*
* Validate the rdataset if possible with available records.
*/
static isc_boolean_t
validate(ns_client_t *client, dns_db_t *db, dns_name_t *name,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
{
isc_result_t result;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_rrsig_t rrsig;
dst_key_t *key = NULL;
dns_rdataset_t keyrdataset;
if (sigrdataset == NULL || !dns_rdataset_isassociated(sigrdataset))
return (ISC_FALSE);
for (result = dns_rdataset_first(sigrdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(sigrdataset)) {
dns_rdata_reset(&rdata);
dns_rdataset_current(sigrdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &rrsig, NULL);
if (result != ISC_R_SUCCESS)
return (ISC_FALSE);
if (!dns_resolver_algorithm_supported(client->view->resolver,
name, rrsig.algorithm))
continue;
if (!dns_name_issubdomain(name, &rrsig.signer))
continue;
dns_rdataset_init(&keyrdataset);
do {
if (!get_key(client, db, &rrsig, &keyrdataset, &key))
break;
if (verify(key, name, rdataset, &rdata, client->mctx,
client->view->acceptexpired)) {
dst_key_free(&key);
dns_rdataset_disassociate(&keyrdataset);
mark_secure(client, db, name,
rrsig.originalttl,
rdataset, sigrdataset);
return (ISC_TRUE);
}
dst_key_free(&key);
} while (1);
if (dns_rdataset_isassociated(&keyrdataset))
dns_rdataset_disassociate(&keyrdataset);
}
return (ISC_FALSE);
}
static void
query_addbestns(ns_client_t *client) {
dns_db_t *db, *zdb;
dns_dbnode_t *node;
dns_name_t *fname, *zfname;
dns_rdataset_t *rdataset, *sigrdataset, *zrdataset, *zsigrdataset;
isc_boolean_t is_zone, use_zone;
isc_buffer_t *dbuf;
isc_result_t result;
dns_dbversion_t *version;
dns_zone_t *zone;
isc_buffer_t b;
CTRACE("query_addbestns");
fname = NULL;
zfname = NULL;
rdataset = NULL;
zrdataset = NULL;
sigrdataset = NULL;
zsigrdataset = NULL;
node = NULL;
db = NULL;
zdb = NULL;
version = NULL;
zone = NULL;
is_zone = ISC_FALSE;
use_zone = ISC_FALSE;
/*
* Find the right database.
*/
result = query_getdb(client, client->query.qname, dns_rdatatype_ns, 0,
&zone, &db, &version, &is_zone);
if (result != ISC_R_SUCCESS)
goto cleanup;
db_find:
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
rdataset = query_newrdataset(client);
if (fname == NULL || rdataset == NULL)
goto cleanup;
/*
* Get the RRSIGs if the client requested them or if we may
* need to validate answers from the cache.
*/
if (WANTDNSSEC(client) || !is_zone) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto cleanup;
}
/*
* Now look for the zonecut.
*/
if (is_zone) {
result = dns_db_find(db, client->query.qname, version,
dns_rdatatype_ns, client->query.dboptions,
client->now, &node, fname,
rdataset, sigrdataset);
if (result != DNS_R_DELEGATION)
goto cleanup;
if (USECACHE(client)) {
query_keepname(client, fname, dbuf);
zdb = db;
zfname = fname;
fname = NULL;
zrdataset = rdataset;
rdataset = NULL;
zsigrdataset = sigrdataset;
sigrdataset = NULL;
dns_db_detachnode(db, &node);
version = NULL;
db = NULL;
dns_db_attach(client->view->cachedb, &db);
is_zone = ISC_FALSE;
goto db_find;
}
} else {
result = dns_db_findzonecut(db, client->query.qname,
client->query.dboptions,
client->now, &node, fname,
rdataset, sigrdataset);
if (result == ISC_R_SUCCESS) {
if (zfname != NULL &&
!dns_name_issubdomain(fname, zfname)) {
/*
* We found a zonecut in the cache, but our
* zone delegation is better.
*/
use_zone = ISC_TRUE;
}
} else if (result == ISC_R_NOTFOUND && zfname != NULL) {
/*
* We didn't find anything in the cache, but we
* have a zone delegation, so use it.
*/
use_zone = ISC_TRUE;
} else
goto cleanup;
}
if (use_zone) {
query_releasename(client, &fname);
fname = zfname;
zfname = NULL;
/*
* We've already done query_keepname() on
* zfname, so we must set dbuf to NULL to
* prevent query_addrrset() from trying to
* call query_keepname() again.
*/
dbuf = NULL;
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
rdataset = zrdataset;
zrdataset = NULL;
sigrdataset = zsigrdataset;
zsigrdataset = NULL;
}
/*
* Attempt to validate RRsets that are pending or that are glue.
*/
if ((DNS_TRUST_PENDING(rdataset->trust) ||
(sigrdataset != NULL && DNS_TRUST_PENDING(sigrdataset->trust)))
&& !validate(client, db, fname, rdataset, sigrdataset) &&
!PENDINGOK(client->query.dboptions))
goto cleanup;
if ((DNS_TRUST_GLUE(rdataset->trust) ||
(sigrdataset != NULL && DNS_TRUST_GLUE(sigrdataset->trust))) &&
!validate(client, db, fname, rdataset, sigrdataset) &&
SECURE(client) && WANTDNSSEC(client))
goto cleanup;
/*
* If the client doesn't want DNSSEC we can discard the sigrdataset
* now.
*/
if (!WANTDNSSEC(client))
query_putrdataset(client, &sigrdataset);
query_addrrset(client, &fname, &rdataset, &sigrdataset, dbuf,
DNS_SECTION_AUTHORITY);
cleanup:
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
if (zdb != NULL) {
query_putrdataset(client, &zrdataset);
if (zsigrdataset != NULL)
query_putrdataset(client, &zsigrdataset);
if (zfname != NULL)
query_releasename(client, &zfname);
dns_db_detach(&zdb);
}
}
static void
fixrdataset(ns_client_t *client, dns_rdataset_t **rdataset) {
if (*rdataset == NULL)
*rdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(*rdataset))
dns_rdataset_disassociate(*rdataset);
}
static void
fixfname(ns_client_t *client, dns_name_t **fname, isc_buffer_t **dbuf,
isc_buffer_t *nbuf)
{
if (*fname == NULL) {
*dbuf = query_getnamebuf(client);
if (*dbuf == NULL)
return;
*fname = query_newname(client, *dbuf, nbuf);
}
}
static void
query_addds(ns_client_t *client, dns_db_t *db, dns_dbnode_t *node,
dns_dbversion_t *version, dns_name_t *name)
{
dns_fixedname_t fixed;
dns_name_t *fname = NULL;
dns_name_t *rname;
dns_rdataset_t *rdataset, *sigrdataset;
isc_buffer_t *dbuf, b;
isc_result_t result;
unsigned int count;
CTRACE("query_addds");
rname = NULL;
rdataset = NULL;
sigrdataset = NULL;
/*
* We'll need some resources...
*/
rdataset = query_newrdataset(client);
sigrdataset = query_newrdataset(client);
if (rdataset == NULL || sigrdataset == NULL)
goto cleanup;
/*
* Look for the DS record, which may or may not be present.
*/
result = dns_db_findrdataset(db, node, version, dns_rdatatype_ds, 0,
client->now, rdataset, sigrdataset);
/*
* If we didn't find it, look for an NSEC.
*/
if (result == ISC_R_NOTFOUND)
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_nsec, 0, client->now,
rdataset, sigrdataset);
if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND)
goto addnsec3;
if (!dns_rdataset_isassociated(rdataset) ||
!dns_rdataset_isassociated(sigrdataset))
goto addnsec3;
/*
* We've already added the NS record, so if the name's not there,
* we have other problems. Use this name rather than calling
* query_addrrset().
*/
result = dns_message_firstname(client->message, DNS_SECTION_AUTHORITY);
if (result != ISC_R_SUCCESS)
goto cleanup;
rname = NULL;
dns_message_currentname(client->message, DNS_SECTION_AUTHORITY,
&rname);
result = dns_message_findtype(rname, dns_rdatatype_ns, 0, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup;
ISC_LIST_APPEND(rname->list, rdataset, link);
ISC_LIST_APPEND(rname->list, sigrdataset, link);
rdataset = NULL;
sigrdataset = NULL;
return;
addnsec3:
if (!dns_db_iszone(db))
goto cleanup;
/*
* Add the NSEC3 which proves the DS does not exist.
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
dns_fixedname_init(&fixed);
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
query_findclosestnsec3(name, db, version, client, rdataset,
sigrdataset, fname, ISC_TRUE,
dns_fixedname_name(&fixed));
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
query_addrrset(client, &fname, &rdataset, &sigrdataset, dbuf,
DNS_SECTION_AUTHORITY);
/*
* Did we find the closest provable encloser instead?
* If so add the nearest to the closest provable encloser.
*/
if (!dns_name_equal(name, dns_fixedname_name(&fixed))) {
count = dns_name_countlabels(dns_fixedname_name(&fixed)) + 1;
dns_name_getlabelsequence(name,
dns_name_countlabels(name) - count,
count, dns_fixedname_name(&fixed));
fixfname(client, &fname, &dbuf, &b);
fixrdataset(client, &rdataset);
fixrdataset(client, &sigrdataset);
if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
goto cleanup;
query_findclosestnsec3(dns_fixedname_name(&fixed), db, version,
client, rdataset, sigrdataset, fname,
ISC_FALSE, NULL);
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
query_addrrset(client, &fname, &rdataset, &sigrdataset, dbuf,
DNS_SECTION_AUTHORITY);
}
cleanup:
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
}
static void
query_addwildcardproof(ns_client_t *client, dns_db_t *db,
dns_dbversion_t *version, dns_name_t *name,
isc_boolean_t ispositive, isc_boolean_t nodata)
{
isc_buffer_t *dbuf, b;
dns_name_t *fname;
dns_rdataset_t *rdataset, *sigrdataset;
dns_fixedname_t wfixed;
dns_name_t *wname;
dns_dbnode_t *node;
unsigned int options;
unsigned int olabels, nlabels, labels;
isc_result_t result;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_nsec_t nsec;
isc_boolean_t have_wname;
int order;
dns_fixedname_t cfixed;
dns_name_t *cname;
CTRACE("query_addwildcardproof");
fname = NULL;
rdataset = NULL;
sigrdataset = NULL;
node = NULL;
/*
* Get the NOQNAME proof then if !ispositive
* get the NOWILDCARD proof.
*
* DNS_DBFIND_NOWILD finds the NSEC records that covers the
* name ignoring any wildcard. From the owner and next names
* of this record you can compute which wildcard (if it exists)
* will match by finding the longest common suffix of the
* owner name and next names with the qname and prefixing that
* with the wildcard label.
*
* e.g.
* Given:
* example SOA
* example NSEC b.example
* b.example A
* b.example NSEC a.d.example
* a.d.example A
* a.d.example NSEC g.f.example
* g.f.example A
* g.f.example NSEC z.i.example
* z.i.example A
* z.i.example NSEC example
*
* QNAME:
* a.example -> example NSEC b.example
* owner common example
* next common example
* wild *.example
* d.b.example -> b.example NSEC a.d.example
* owner common b.example
* next common example
* wild *.b.example
* a.f.example -> a.d.example NSEC g.f.example
* owner common example
* next common f.example
* wild *.f.example
* j.example -> z.i.example NSEC example
* owner common example
* next common example
* wild *.example
*/
options = client->query.dboptions | DNS_DBFIND_NOWILD;
dns_fixedname_init(&wfixed);
wname = dns_fixedname_name(&wfixed);
again:
have_wname = ISC_FALSE;
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
rdataset = query_newrdataset(client);
sigrdataset = query_newrdataset(client);
if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
goto cleanup;
result = dns_db_find(db, name, version, dns_rdatatype_nsec, options,
0, &node, fname, rdataset, sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
if (!dns_rdataset_isassociated(rdataset)) {
/*
* No NSEC proof available, return NSEC3 proofs instead.
*/
dns_fixedname_init(&cfixed);
cname = dns_fixedname_name(&cfixed);
/*
* Find the closest encloser.
*/
dns_name_copy(name, cname, NULL);
while (result == DNS_R_NXDOMAIN) {
labels = dns_name_countlabels(cname) - 1;
dns_name_split(cname, labels, NULL, cname);
result = dns_db_find(db, cname, version,
dns_rdatatype_nsec,
options, 0, NULL, fname,
NULL, NULL);
}
/*
* Add closest (provable) encloser NSEC3.
*/
query_findclosestnsec3(cname, db, NULL, client, rdataset,
sigrdataset, fname, ISC_TRUE, cname);
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
query_addrrset(client, &fname, &rdataset, &sigrdataset,
dbuf, DNS_SECTION_AUTHORITY);
/*
* Replace resources which were consumed by query_addrrset.
*/
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
}
if (rdataset == NULL)
rdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset == NULL)
sigrdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
goto cleanup;
/*
* Add no qname proof.
*/
labels = dns_name_countlabels(cname) + 1;
if (dns_name_countlabels(name) == labels)
dns_name_copy(name, wname, NULL);
else
dns_name_split(name, labels, NULL, wname);
query_findclosestnsec3(wname, db, NULL, client, rdataset,
sigrdataset, fname, ISC_FALSE, NULL);
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
query_addrrset(client, &fname, &rdataset, &sigrdataset,
dbuf, DNS_SECTION_AUTHORITY);
if (ispositive)
goto cleanup;
/*
* Replace resources which were consumed by query_addrrset.
*/
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
}
if (rdataset == NULL)
rdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset == NULL)
sigrdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
goto cleanup;
/*
* Add the no wildcard proof.
*/
result = dns_name_concatenate(dns_wildcardname,
cname, wname, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup;
query_findclosestnsec3(wname, db, NULL, client, rdataset,
sigrdataset, fname, nodata, NULL);
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
query_addrrset(client, &fname, &rdataset, &sigrdataset,
dbuf, DNS_SECTION_AUTHORITY);
goto cleanup;
} else if (result == DNS_R_NXDOMAIN) {
if (!ispositive)
result = dns_rdataset_first(rdataset);
if (result == ISC_R_SUCCESS) {
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &nsec, NULL);
}
if (result == ISC_R_SUCCESS) {
(void)dns_name_fullcompare(name, fname, &order,
&olabels);
(void)dns_name_fullcompare(name, &nsec.next, &order,
&nlabels);
/*
* Check for a pathological condition created when
* serving some malformed signed zones and bail out.
*/
if (dns_name_countlabels(name) == nlabels)
goto cleanup;
if (olabels > nlabels)
dns_name_split(name, olabels, NULL, wname);
else
dns_name_split(name, nlabels, NULL, wname);
result = dns_name_concatenate(dns_wildcardname,
wname, wname, NULL);
if (result == ISC_R_SUCCESS)
have_wname = ISC_TRUE;
dns_rdata_freestruct(&nsec);
}
query_addrrset(client, &fname, &rdataset, &sigrdataset,
dbuf, DNS_SECTION_AUTHORITY);
}
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
if (have_wname) {
ispositive = ISC_TRUE; /* prevent loop */
if (!dns_name_equal(name, wname)) {
name = wname;
goto again;
}
}
cleanup:
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
}
static void
query_addnxrrsetnsec(ns_client_t *client, dns_db_t *db,
dns_dbversion_t *version, dns_name_t **namep,
dns_rdataset_t **rdatasetp, dns_rdataset_t **sigrdatasetp)
{
dns_name_t *name;
dns_rdataset_t *sigrdataset;
dns_rdata_t sigrdata;
dns_rdata_rrsig_t sig;
unsigned int labels;
isc_buffer_t *dbuf, b;
dns_name_t *fname;
isc_result_t result;
name = *namep;
if ((name->attributes & DNS_NAMEATTR_WILDCARD) == 0) {
query_addrrset(client, namep, rdatasetp, sigrdatasetp,
NULL, DNS_SECTION_AUTHORITY);
return;
}
if (sigrdatasetp == NULL)
return;
sigrdataset = *sigrdatasetp;
if (sigrdataset == NULL || !dns_rdataset_isassociated(sigrdataset))
return;
result = dns_rdataset_first(sigrdataset);
if (result != ISC_R_SUCCESS)
return;
dns_rdata_init(&sigrdata);
dns_rdataset_current(sigrdataset, &sigrdata);
result = dns_rdata_tostruct(&sigrdata, &sig, NULL);
if (result != ISC_R_SUCCESS)
return;
labels = dns_name_countlabels(name);
if ((unsigned int)sig.labels + 1 >= labels)
return;
/* XXX */
query_addwildcardproof(client, db, version, client->query.qname,
ISC_TRUE, ISC_FALSE);
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
return;
fname = query_newname(client, dbuf, &b);
if (fname == NULL)
return;
dns_name_split(name, sig.labels + 1, NULL, fname);
/* This will succeed, since we've stripped labels. */
RUNTIME_CHECK(dns_name_concatenate(dns_wildcardname, fname, fname,
NULL) == ISC_R_SUCCESS);
query_addrrset(client, &fname, rdatasetp, sigrdatasetp,
dbuf, DNS_SECTION_AUTHORITY);
}
static void
query_resume(isc_task_t *task, isc_event_t *event) {
dns_fetchevent_t *devent = (dns_fetchevent_t *)event;
dns_fetch_t *fetch;
ns_client_t *client;
isc_boolean_t fetch_canceled, client_shuttingdown;
isc_result_t result;
isc_logcategory_t *logcategory = NS_LOGCATEGORY_QUERY_EERRORS;
int errorloglevel;
/*
* Resume a query after recursion.
*/
UNUSED(task);
REQUIRE(event->ev_type == DNS_EVENT_FETCHDONE);
client = devent->ev_arg;
REQUIRE(NS_CLIENT_VALID(client));
REQUIRE(task == client->task);
REQUIRE(RECURSING(client));
LOCK(&client->query.fetchlock);
if (client->query.fetch != NULL) {
/*
* This is the fetch we've been waiting for.
*/
INSIST(devent->fetch == client->query.fetch);
client->query.fetch = NULL;
fetch_canceled = ISC_FALSE;
/*
* Update client->now.
*/
isc_stdtime_get(&client->now);
} else {
/*
* This is a fetch completion event for a canceled fetch.
* Clean up and don't resume the find.
*/
fetch_canceled = ISC_TRUE;
}
UNLOCK(&client->query.fetchlock);
INSIST(client->query.fetch == NULL);
client->query.attributes &= ~NS_QUERYATTR_RECURSING;
fetch = devent->fetch;
devent->fetch = NULL;
/*
* If this client is shutting down, or this transaction
* has timed out, do not resume the find.
*/
client_shuttingdown = ns_client_shuttingdown(client);
if (fetch_canceled || client_shuttingdown) {
if (devent->node != NULL)
dns_db_detachnode(devent->db, &devent->node);
if (devent->db != NULL)
dns_db_detach(&devent->db);
query_putrdataset(client, &devent->rdataset);
if (devent->sigrdataset != NULL)
query_putrdataset(client, &devent->sigrdataset);
isc_event_free(&event);
if (fetch_canceled)
query_error(client, DNS_R_SERVFAIL, __LINE__);
else
query_next(client, ISC_R_CANCELED);
/*
* This may destroy the client.
*/
ns_client_detach(&client);
} else {
result = query_find(client, devent, 0);
if (result != ISC_R_SUCCESS) {
if (result == DNS_R_SERVFAIL)
errorloglevel = ISC_LOG_DEBUG(2);
else
errorloglevel = ISC_LOG_DEBUG(4);
if (isc_log_wouldlog(ns_g_lctx, errorloglevel)) {
dns_resolver_logfetch(fetch, ns_g_lctx,
logcategory,
NS_LOGMODULE_QUERY,
errorloglevel, ISC_FALSE);
}
}
}
dns_resolver_destroyfetch(&fetch);
}
static isc_result_t
query_recurse(ns_client_t *client, dns_rdatatype_t qtype, dns_name_t *qname,
dns_name_t *qdomain, dns_rdataset_t *nameservers,
isc_boolean_t resuming)
{
isc_result_t result;
dns_rdataset_t *rdataset, *sigrdataset;
isc_sockaddr_t *peeraddr;
if (!resuming)
inc_stats(client, dns_nsstatscounter_recursion);
/*
* We are about to recurse, which means that this client will
* be unavailable for serving new requests for an indeterminate
* amount of time. If this client is currently responsible
* for handling incoming queries, set up a new client
* object to handle them while we are waiting for a
* response. There is no need to replace TCP clients
* because those have already been replaced when the
* connection was accepted (if allowed by the TCP quota).
*/
if (client->recursionquota == NULL) {
result = isc_quota_attach(&ns_g_server->recursionquota,
&client->recursionquota);
if (result == ISC_R_SOFTQUOTA) {
static isc_stdtime_t last = 0;
isc_stdtime_t now;
isc_stdtime_get(&now);
if (now != last) {
last = now;
ns_client_log(client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"recursive-clients soft limit "
"exceeded (%d/%d/%d), "
"aborting oldest query",
client->recursionquota->used,
client->recursionquota->soft,
client->recursionquota->max);
}
ns_client_killoldestquery(client);
result = ISC_R_SUCCESS;
} else if (result == ISC_R_QUOTA) {
static isc_stdtime_t last = 0;
isc_stdtime_t now;
isc_stdtime_get(&now);
if (now != last) {
last = now;
ns_client_log(client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"no more recursive clients "
"(%d/%d/%d): %s",
ns_g_server->recursionquota.used,
ns_g_server->recursionquota.soft,
ns_g_server->recursionquota.max,
isc_result_totext(result));
}
ns_client_killoldestquery(client);
}
if (result == ISC_R_SUCCESS && !client->mortal &&
(client->attributes & NS_CLIENTATTR_TCP) == 0) {
result = ns_client_replace(client);
if (result != ISC_R_SUCCESS) {
ns_client_log(client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"ns_client_replace() failed: %s",
isc_result_totext(result));
isc_quota_detach(&client->recursionquota);
}
}
if (result != ISC_R_SUCCESS)
return (result);
ns_client_recursing(client);
}
/*
* Invoke the resolver.
*/
REQUIRE(nameservers == NULL || nameservers->type == dns_rdatatype_ns);
REQUIRE(client->query.fetch == NULL);
rdataset = query_newrdataset(client);
if (rdataset == NULL)
return (ISC_R_NOMEMORY);
if (WANTDNSSEC(client)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL) {
query_putrdataset(client, &rdataset);
return (ISC_R_NOMEMORY);
}
} else
sigrdataset = NULL;
if (client->query.timerset == ISC_FALSE)
ns_client_settimeout(client, 60);
if ((client->attributes & NS_CLIENTATTR_TCP) == 0)
peeraddr = &client->peeraddr;
else
peeraddr = NULL;
result = dns_resolver_createfetch2(client->view->resolver,
qname, qtype, qdomain, nameservers,
NULL, peeraddr, client->message->id,
client->query.fetchoptions,
client->task,
query_resume, client,
rdataset, sigrdataset,
&client->query.fetch);
if (result == ISC_R_SUCCESS) {
/*
* Record that we're waiting for an event. A client which
* is shutting down will not be destroyed until all the
* events have been received.
*/
} else {
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
}
return (result);
}
static inline void
rpz_clean(dns_zone_t **zonep, dns_db_t **dbp, dns_dbnode_t **nodep,
dns_rdataset_t **rdatasetp)
{
if (nodep != NULL && *nodep != NULL) {
REQUIRE(dbp != NULL && *dbp != NULL);
dns_db_detachnode(*dbp, nodep);
}
if (dbp != NULL && *dbp != NULL)
dns_db_detach(dbp);
if (zonep != NULL && *zonep != NULL)
dns_zone_detach(zonep);
if (rdatasetp != NULL && *rdatasetp != NULL &&
dns_rdataset_isassociated(*rdatasetp))
dns_rdataset_disassociate(*rdatasetp);
}
static inline isc_result_t
rpz_ready(ns_client_t *client, dns_zone_t **zonep, dns_db_t **dbp,
dns_dbnode_t **nodep, dns_rdataset_t **rdatasetp)
{
REQUIRE(rdatasetp != NULL);
rpz_clean(zonep, dbp, nodep, rdatasetp);
if (*rdatasetp == NULL) {
*rdatasetp = query_newrdataset(client);
if (*rdatasetp == NULL)
return (DNS_R_SERVFAIL);
}
return (ISC_R_SUCCESS);
}
static void
rpz_st_clear(ns_client_t *client) {
dns_rpz_st_t *st = client->query.rpz_st;
rpz_clean(&st->m.zone, &st->m.db, &st->m.node, NULL);
if (st->m.rdataset != NULL)
query_putrdataset(client, &st->m.rdataset);
rpz_clean(NULL, &st->ns.db, NULL, NULL);
if (st->ns.ns_rdataset != NULL)
query_putrdataset(client, &st->ns.ns_rdataset);
if (st->ns.r_rdataset != NULL)
query_putrdataset(client, &st->ns.r_rdataset);
rpz_clean(&st->q.zone, &st->q.db, &st->q.node, NULL);
if (st->q.rdataset != NULL)
query_putrdataset(client, &st->q.rdataset);
if (st->q.sigrdataset != NULL)
query_putrdataset(client, &st->q.sigrdataset);
st->state = 0;
}
/*
* Get NS, A, or AAAA rrset for rpz nsdname or nsip checking.
*/
static isc_result_t
rpz_ns_find(ns_client_t *client, dns_name_t *name, dns_rdatatype_t type,
dns_db_t **dbp, dns_dbversion_t *version,
dns_rdataset_t **rdatasetp, isc_boolean_t resuming)
{
dns_rpz_st_t *st;
isc_boolean_t is_zone;
dns_dbnode_t *node;
dns_fixedname_t fixed;
dns_name_t *found;
isc_result_t result;
st = client->query.rpz_st;
if ((st->state & DNS_RPZ_RECURSING) != 0) {
INSIST(st->ns.r_type == type);
INSIST(dns_name_equal(name, st->r_name));
INSIST(*rdatasetp == NULL ||
!dns_rdataset_isassociated(*rdatasetp));
st->state &= ~DNS_RPZ_RECURSING;
*dbp = st->ns.db;
st->ns.db = NULL;
if (*rdatasetp != NULL)
query_putrdataset(client, rdatasetp);
*rdatasetp = st->ns.r_rdataset;
st->ns.r_rdataset = NULL;
result = st->ns.r_result;
if (result == DNS_R_DELEGATION) {
rpz_fail_log(client, DNS_RPZ_ERROR_LEVEL,
DNS_RPZ_TYPE_NSIP, name,
"rpz_ns_find() ", result);
st->m.policy = DNS_RPZ_POLICY_ERROR;
result = DNS_R_SERVFAIL;
}
return (result);
}
result = rpz_ready(client, NULL, NULL, NULL, rdatasetp);
if (result != ISC_R_SUCCESS) {
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (result);
}
if (*dbp != NULL) {
is_zone = ISC_FALSE;
} else {
dns_zone_t *zone;
version = NULL;
zone = NULL;
result = query_getdb(client, name, type, 0, &zone, dbp,
&version, &is_zone);
if (result != ISC_R_SUCCESS) {
rpz_fail_log(client, DNS_RPZ_ERROR_LEVEL,
DNS_RPZ_TYPE_NSIP, name, "NS getdb() ",
result);
st->m.policy = DNS_RPZ_POLICY_ERROR;
if (zone != NULL)
dns_zone_detach(&zone);
return (result);
}
if (zone != NULL)
dns_zone_detach(&zone);
}
node = NULL;
dns_fixedname_init(&fixed);
found = dns_fixedname_name(&fixed);
result = dns_db_find(*dbp, name, version, type, 0, client->now, &node,
found, *rdatasetp, NULL);
if (result == DNS_R_DELEGATION && is_zone && USECACHE(client)) {
/*
* Try the cache if we're authoritative for an
* ancestor but not the domain itself.
*/
rpz_clean(NULL, dbp, &node, rdatasetp);
version = NULL;
dns_db_attach(client->view->cachedb, dbp);
result = dns_db_find(*dbp, name, version, dns_rdatatype_ns,
0, client->now, &node, found,
*rdatasetp, NULL);
}
rpz_clean(NULL, dbp, &node, NULL);
if (result == DNS_R_DELEGATION) {
/*
* Recurse to get NS rrset or A or AAAA rrset for an NS name.
*/
rpz_clean(NULL, NULL, NULL, rdatasetp);
dns_name_copy(name, st->r_name, NULL);
result = query_recurse(client, type, st->r_name, NULL, NULL,
resuming);
if (result == ISC_R_SUCCESS) {
st->state |= DNS_RPZ_RECURSING;
result = DNS_R_DELEGATION;
}
}
return (result);
}
/*
* Check the IP address in an A or AAAA rdataset against
* the IP or NSIP response policy rules of a view.
*/
static isc_result_t
rpz_rewrite_ip(ns_client_t *client, dns_rdataset_t *rdataset,
dns_rpz_type_t rpz_type)
{
dns_rpz_st_t *st;
dns_dbversion_t *version;
dns_zone_t *zone;
dns_db_t *db;
dns_rpz_zone_t *new_rpz;
isc_result_t result;
st = client->query.rpz_st;
if (st->m.rdataset == NULL) {
st->m.rdataset = query_newrdataset(client);
if (st->m.rdataset == NULL)
return (DNS_R_SERVFAIL);
}
zone = NULL;
db = NULL;
for (new_rpz = ISC_LIST_HEAD(client->view->rpz_zones);
new_rpz != NULL;
new_rpz = ISC_LIST_NEXT(new_rpz, link)) {
version = NULL;
/*
* Find the database for this policy zone to get its
* radix tree.
*/
result = rpz_getdb(client, rpz_type, &new_rpz->origin,
&zone, &db, &version);
if (result != ISC_R_SUCCESS) {
rpz_clean(&zone, &db, NULL, NULL);
continue;
}
/*
* Look for a better (e.g. longer prefix) hit for an IP address
* in this rdataset in this radix tree than than the previous
* hit, if any. Note the domain name and quality of the
* best hit.
*/
result = dns_db_rpz_findips(new_rpz, rpz_type, zone, db,
version, rdataset, st);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
rpz_clean(&zone, &db, NULL, NULL);
}
return (ISC_R_SUCCESS);
}
static isc_result_t
rpz_rewrite_nsip(ns_client_t *client, dns_rdatatype_t type, dns_name_t *name,
dns_db_t **dbp, dns_dbversion_t *version,
dns_rdataset_t **rdatasetp, isc_boolean_t resuming)
{
isc_result_t result;
result = rpz_ns_find(client, name, type, dbp, version, rdatasetp,
resuming);
switch (result) {
case ISC_R_SUCCESS:
result = rpz_rewrite_ip(client, *rdatasetp, DNS_RPZ_TYPE_NSIP);
break;
case DNS_R_EMPTYNAME:
case DNS_R_EMPTYWILD:
case DNS_R_NXDOMAIN:
case DNS_R_NCACHENXDOMAIN:
case DNS_R_NXRRSET:
case DNS_R_NCACHENXRRSET:
result = ISC_R_SUCCESS;
break;
case DNS_R_DELEGATION:
case DNS_R_DUPLICATE:
case DNS_R_DROP:
break;
default:
if (client->query.rpz_st->m.policy != DNS_RPZ_POLICY_ERROR) {
client->query.rpz_st->m.policy = DNS_RPZ_POLICY_ERROR;
rpz_fail_log(client, ISC_LOG_WARNING, DNS_RPZ_TYPE_NSIP,
name, "NS address rewrite nsip ", result);
}
break;
}
return (result);
}
/*
* Get the rrset from a response policy zone.
*/
static isc_result_t
rpz_find(ns_client_t *client, dns_rdatatype_t qtype, dns_name_t *qnamef,
dns_name_t *sname, dns_rpz_type_t rpz_type, dns_zone_t **zonep,
dns_db_t **dbp, dns_dbnode_t **nodep, dns_rdataset_t **rdatasetp,
dns_rpz_policy_t *policyp)
{
dns_dbversion_t *version;
dns_rpz_policy_t policy;
dns_fixedname_t fixed;
dns_name_t *found;
isc_result_t result;
result = rpz_ready(client, zonep, dbp, nodep, rdatasetp);
if (result != ISC_R_SUCCESS) {
*policyp = DNS_RPZ_POLICY_ERROR;
return (result);
}
/*
* Try to get either a CNAME or the type of record demanded by the
* request from the policy zone.
*/
version = NULL;
result = rpz_getdb(client, rpz_type, qnamef, zonep, dbp, &version);
if (result != ISC_R_SUCCESS) {
*policyp = DNS_RPZ_POLICY_MISS;
return (DNS_R_NXDOMAIN);
}
dns_fixedname_init(&fixed);
found = dns_fixedname_name(&fixed);
result = dns_db_find(*dbp, qnamef, version, dns_rdatatype_any, 0,
client->now, nodep, found, *rdatasetp, NULL);
if (result == ISC_R_SUCCESS) {
dns_rdatasetiter_t *rdsiter;
rdsiter = NULL;
result = dns_db_allrdatasets(*dbp, *nodep, version, 0,
&rdsiter);
if (result != ISC_R_SUCCESS) {
dns_db_detachnode(*dbp, nodep);
rpz_fail_log(client, DNS_RPZ_ERROR_LEVEL, rpz_type,
qnamef, "allrdatasets()", result);
*policyp = DNS_RPZ_POLICY_ERROR;
return (DNS_R_SERVFAIL);
}
for (result = dns_rdatasetiter_first(rdsiter);
result == ISC_R_SUCCESS;
result = dns_rdatasetiter_next(rdsiter)) {
dns_rdatasetiter_current(rdsiter, *rdatasetp);
if ((*rdatasetp)->type == dns_rdatatype_cname ||
(*rdatasetp)->type == qtype)
break;
dns_rdataset_disassociate(*rdatasetp);
}
dns_rdatasetiter_destroy(&rdsiter);
if (result != ISC_R_SUCCESS) {
if (result != ISC_R_NOMORE) {
rpz_fail_log(client, DNS_RPZ_ERROR_LEVEL,
rpz_type, qnamef, "rdatasetiter",
result);
*policyp = DNS_RPZ_POLICY_ERROR;
return (DNS_R_SERVFAIL);
}
/*
* Ask again to get the right DNS_R_DNAME/NXRRSET/...
* result if there is neither a CNAME nor target type.
*/
if (dns_rdataset_isassociated(*rdatasetp))
dns_rdataset_disassociate(*rdatasetp);
dns_db_detachnode(*dbp, nodep);
if (qtype == dns_rdatatype_rrsig ||
qtype == dns_rdatatype_sig)
result = DNS_R_NXRRSET;
else
result = dns_db_find(*dbp, qnamef, version,
qtype, 0, client->now,
nodep, found, *rdatasetp,
NULL);
}
}
switch (result) {
case ISC_R_SUCCESS:
if ((*rdatasetp)->type != dns_rdatatype_cname) {
policy = DNS_RPZ_POLICY_RECORD;
} else {
policy = dns_rpz_decode_cname(*rdatasetp, sname);
if (policy == DNS_RPZ_POLICY_RECORD &&
qtype != dns_rdatatype_cname &&
qtype != dns_rdatatype_any)
result = DNS_R_CNAME;
}
break;
case DNS_R_DNAME:
policy = DNS_RPZ_POLICY_RECORD;
break;
case DNS_R_NXRRSET:
policy = DNS_RPZ_POLICY_NODATA;
break;
case DNS_R_NXDOMAIN:
case DNS_R_EMPTYNAME:
/*
* If we don't get a qname hit,
* see if it is worth looking for other types.
*/
dns_db_rpz_enabled(*dbp, client->query.rpz_st);
dns_db_detach(dbp);
dns_zone_detach(zonep);
policy = DNS_RPZ_POLICY_MISS;
break;
default:
dns_db_detach(dbp);
dns_zone_detach(zonep);
rpz_fail_log(client, DNS_RPZ_ERROR_LEVEL, rpz_type, qnamef,
"", result);
policy = DNS_RPZ_POLICY_ERROR;
result = DNS_R_SERVFAIL;
break;
}
*policyp = policy;
return (result);
}
/*
* Build and look for a QNAME or NSDNAME owner name in a response policy zone.
*/
static isc_result_t
rpz_rewrite_name(ns_client_t *client, dns_rdatatype_t qtype, dns_name_t *qname,
dns_rpz_type_t rpz_type, dns_rdataset_t **rdatasetp)
{
dns_rpz_st_t *st;
dns_rpz_zone_t *rpz;
dns_fixedname_t prefixf, rpz_qnamef;
dns_name_t *prefix, *suffix, *rpz_qname;
dns_zone_t *zone;
dns_db_t *db;
dns_dbnode_t *node;
dns_rpz_policy_t policy;
unsigned int labels;
isc_result_t result;
st = client->query.rpz_st;
zone = NULL;
db = NULL;
node = NULL;
for (rpz = ISC_LIST_HEAD(client->view->rpz_zones);
rpz != NULL;
rpz = ISC_LIST_NEXT(rpz, link)) {
/*
* Construct the rule's owner name.
*/
dns_fixedname_init(&prefixf);
prefix = dns_fixedname_name(&prefixf);
dns_name_split(qname, 1, prefix, NULL);
if (rpz_type == DNS_RPZ_TYPE_NSDNAME)
suffix = &rpz->nsdname;
else
suffix = &rpz->origin;
dns_fixedname_init(&rpz_qnamef);
rpz_qname = dns_fixedname_name(&rpz_qnamef);
for (;;) {
result = dns_name_concatenate(prefix, suffix,
rpz_qname, NULL);
if (result == ISC_R_SUCCESS)
break;
INSIST(result == DNS_R_NAMETOOLONG);
labels = dns_name_countlabels(prefix);
if (labels < 2) {
rpz_fail_log(client, DNS_RPZ_ERROR_LEVEL,
rpz_type, suffix,
"concatentate() ", result);
return (ISC_R_SUCCESS);
}
if (labels+1 == dns_name_countlabels(qname)) {
rpz_fail_log(client, DNS_RPZ_DEBUG_LEVEL1,
rpz_type, suffix,
"concatentate() ", result);
}
dns_name_split(prefix, labels - 1, NULL, prefix);
}
/*
* See if the qname rule (or RR) exists.
*/
result = rpz_find(client, qtype, rpz_qname, qname, rpz_type,
&zone, &db, &node, rdatasetp, &policy);
switch (result) {
case DNS_R_NXDOMAIN:
case DNS_R_EMPTYNAME:
break;
case DNS_R_SERVFAIL:
rpz_clean(&zone, &db, &node, rdatasetp);
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (DNS_R_SERVFAIL);
default:
/*
* when more than one name or address hits a rule,
* prefer the first set of names (qname or NS),
* the first policy zone, and the smallest name
*/
if (st->m.type == rpz_type &&
rpz->num > st->m.rpz->num &&
0 <= dns_name_compare(rpz_qname, st->qname))
continue;
rpz_clean(&st->m.zone, &st->m.db, &st->m.node,
&st->m.rdataset);
st->m.rpz = rpz;
st->m.type = rpz_type;
st->m.prefix = 0;
st->m.policy = policy;
st->m.result = result;
dns_name_copy(rpz_qname, st->qname, NULL);
if (dns_rdataset_isassociated(*rdatasetp)) {
dns_rdataset_t *trdataset;
trdataset = st->m.rdataset;
st->m.rdataset = *rdatasetp;
*rdatasetp = trdataset;
st->m.ttl = st->m.rdataset->ttl;
} else {
st->m.ttl = DNS_RPZ_TTL_DEFAULT;
}
st->m.node = node;
node = NULL;
st->m.db = db;
db = NULL;
st->m.zone = zone;
zone = NULL;
}
}
rpz_clean(&zone, &db, &node, rdatasetp);
return (ISC_R_SUCCESS);
}
/*
* Look for response policy zone NSIP and NSDNAME rewriting.
*/
static isc_result_t
rpz_rewrite(ns_client_t *client, dns_rdatatype_t qtype,
isc_boolean_t resuming)
{
dns_rpz_st_t *st;
dns_db_t *ipdb;
dns_rdataset_t *rdataset;
dns_fixedname_t nsnamef;
dns_name_t *nsname;
dns_dbversion_t *version;
isc_result_t result;
ipdb = NULL;
rdataset = NULL;
st = client->query.rpz_st;
if (st == NULL) {
st = isc_mem_get(client->mctx, sizeof(*st));
if (st == NULL)
return (ISC_R_NOMEMORY);
st->state = 0;
memset(&st->m, 0, sizeof(st->m));
memset(&st->ns, 0, sizeof(st->ns));
memset(&st->q, 0, sizeof(st->q));
dns_fixedname_init(&st->_qnamef);
dns_fixedname_init(&st->_r_namef);
dns_fixedname_init(&st->_fnamef);
st->qname = dns_fixedname_name(&st->_qnamef);
st->r_name = dns_fixedname_name(&st->_r_namef);
st->fname = dns_fixedname_name(&st->_fnamef);
client->query.rpz_st = st;
}
if ((st->state & DNS_RPZ_DONE_QNAME) == 0) {
st->state = DNS_RPZ_DONE_QNAME;
st->m.type = DNS_RPZ_TYPE_BAD;
st->m.policy = DNS_RPZ_POLICY_MISS;
/*
* Check rules for the name if this it the first time,
* i.e. we've not been recursing.
*/
st->state &= ~(DNS_RPZ_HAVE_IP | DNS_RPZ_HAVE_NSIPv4 |
DNS_RPZ_HAVE_NSIPv6 | DNS_RPZ_HAD_NSDNAME);
result = rpz_rewrite_name(client, qtype, client->query.qname,
DNS_RPZ_TYPE_QNAME, &rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
if (st->m.policy != DNS_RPZ_POLICY_MISS)
goto cleanup;
if ((st->state & (DNS_RPZ_HAVE_NSIPv4 | DNS_RPZ_HAVE_NSIPv6 |
DNS_RPZ_HAD_NSDNAME)) == 0)
goto cleanup;
st->ns.label = dns_name_countlabels(client->query.qname);
}
dns_fixedname_init(&nsnamef);
dns_name_clone(client->query.qname, dns_fixedname_name(&nsnamef));
while (st->ns.label > 1 && st->m.policy == DNS_RPZ_POLICY_MISS) {
if (st->ns.label == dns_name_countlabels(client->query.qname)) {
nsname = client->query.qname;
} else {
nsname = dns_fixedname_name(&nsnamef);
dns_name_split(client->query.qname, st->ns.label,
NULL, nsname);
}
if (st->ns.ns_rdataset == NULL ||
!dns_rdataset_isassociated(st->ns.ns_rdataset)) {
dns_db_t *db = NULL;
result = rpz_ns_find(client, nsname, dns_rdatatype_ns,
&db, NULL, &st->ns.ns_rdataset,
resuming);
if (db != NULL)
dns_db_detach(&db);
if (result != ISC_R_SUCCESS) {
if (result == DNS_R_DELEGATION)
goto cleanup;
if (result == DNS_R_EMPTYNAME ||
result == DNS_R_NXRRSET ||
result == DNS_R_EMPTYWILD ||
result == DNS_R_NXDOMAIN ||
result == DNS_R_NCACHENXDOMAIN ||
result == DNS_R_NCACHENXRRSET ||
result == DNS_R_CNAME ||
result == DNS_R_DNAME) {
rpz_fail_log(client,
DNS_RPZ_DEBUG_LEVEL2,
DNS_RPZ_TYPE_NSIP, nsname,
"NS db_find() ", result);
dns_rdataset_disassociate(st->ns.
ns_rdataset);
st->ns.label--;
continue;
}
if (st->m.policy != DNS_RPZ_POLICY_ERROR) {
rpz_fail_log(client, DNS_RPZ_INFO_LEVEL,
DNS_RPZ_TYPE_NSIP, nsname,
"NS db_find() ", result);
st->m.policy = DNS_RPZ_POLICY_ERROR;
}
goto cleanup;
}
result = dns_rdataset_first(st->ns.ns_rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
}
/*
* Check all NS names.
*/
do {
dns_rdata_ns_t ns;
dns_rdata_t nsrdata = DNS_RDATA_INIT;
dns_rdataset_current(st->ns.ns_rdataset, &nsrdata);
result = dns_rdata_tostruct(&nsrdata, &ns, NULL);
dns_rdata_reset(&nsrdata);
if (result != ISC_R_SUCCESS) {
rpz_fail_log(client, DNS_RPZ_ERROR_LEVEL,
DNS_RPZ_TYPE_NSIP, nsname,
"rdata_tostruct() ", result);
st->m.policy = DNS_RPZ_POLICY_ERROR;
goto cleanup;
}
if ((st->state & DNS_RPZ_HAD_NSDNAME) != 0) {
result = rpz_rewrite_name(client, qtype,
&ns.name,
DNS_RPZ_TYPE_NSDNAME,
&rdataset);
if (result != ISC_R_SUCCESS) {
dns_rdata_freestruct(&ns);
goto cleanup;
}
}
/*
* Check all IP addresses for this NS name, but don't
* bother without NSIP rules or with a NSDNAME hit.
*/
version = NULL;
if ((st->state & DNS_RPZ_HAVE_NSIPv4) != 0 &&
st->m.type != DNS_RPZ_TYPE_NSDNAME &&
(st->state & DNS_RPZ_DONE_A) == 0) {
result = rpz_rewrite_nsip(client,
dns_rdatatype_a,
&ns.name, &ipdb,
version, &rdataset,
resuming);
if (result == ISC_R_SUCCESS)
st->state |= DNS_RPZ_DONE_A;
}
if (result == ISC_R_SUCCESS &&
(st->state & DNS_RPZ_HAVE_NSIPv6) != 0 &&
st->m.type != DNS_RPZ_TYPE_NSDNAME) {
result = rpz_rewrite_nsip(client,
dns_rdatatype_aaaa,
&ns.name, &ipdb,
version, &rdataset,
resuming);
}
dns_rdata_freestruct(&ns);
if (ipdb != NULL)
dns_db_detach(&ipdb);
if (result != ISC_R_SUCCESS)
goto cleanup;
st->state &= ~DNS_RPZ_DONE_A;
result = dns_rdataset_next(st->ns.ns_rdataset);
} while (result == ISC_R_SUCCESS);
dns_rdataset_disassociate(st->ns.ns_rdataset);
st->ns.label--;
}
/*
* Use the best, if any, hit.
*/
result = ISC_R_SUCCESS;
cleanup:
if (st->m.policy != DNS_RPZ_POLICY_MISS &&
st->m.policy != DNS_RPZ_POLICY_NO_OP &&
st->m.policy != DNS_RPZ_POLICY_ERROR &&
st->m.rpz->policy != DNS_RPZ_POLICY_GIVEN)
st->m.policy = st->m.rpz->policy;
if (st->m.policy == DNS_RPZ_POLICY_NO_OP)
rpz_log(client);
if (st->m.policy == DNS_RPZ_POLICY_MISS ||
st->m.policy == DNS_RPZ_POLICY_NO_OP ||
st->m.policy == DNS_RPZ_POLICY_ERROR)
rpz_clean(&st->m.zone, &st->m.db, &st->m.node, &st->m.rdataset);
if (st->m.policy != DNS_RPZ_POLICY_MISS)
st->state |= DNS_RPZ_REWRITTEN;
if (st->m.policy == DNS_RPZ_POLICY_ERROR) {
st->m.type = DNS_RPZ_TYPE_BAD;
result = DNS_R_SERVFAIL;
}
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if ((st->state & DNS_RPZ_RECURSING) == 0) {
rpz_clean(NULL, &st->ns.db, NULL, &st->ns.ns_rdataset);
}
return (result);
}
#define MAX_RESTARTS 16
#define QUERY_ERROR(r) \
do { \
eresult = r; \
want_restart = ISC_FALSE; \
line = __LINE__; \
} while (0)
#define RECURSE_ERROR(r) \
do { \
if ((r) == DNS_R_DUPLICATE || (r) == DNS_R_DROP) \
QUERY_ERROR(r); \
else \
QUERY_ERROR(DNS_R_SERVFAIL); \
} while (0)
/*
* Extract a network address from the RDATA of an A or AAAA
* record.
*
* Returns:
* ISC_R_SUCCESS
* ISC_R_NOTIMPLEMENTED The rdata is not a known address type.
*/
static isc_result_t
rdata_tonetaddr(const dns_rdata_t *rdata, isc_netaddr_t *netaddr) {
struct in_addr ina;
struct in6_addr in6a;
switch (rdata->type) {
case dns_rdatatype_a:
INSIST(rdata->length == 4);
memcpy(&ina.s_addr, rdata->data, 4);
isc_netaddr_fromin(netaddr, &ina);
return (ISC_R_SUCCESS);
case dns_rdatatype_aaaa:
INSIST(rdata->length == 16);
memcpy(in6a.s6_addr, rdata->data, 16);
isc_netaddr_fromin6(netaddr, &in6a);
return (ISC_R_SUCCESS);
default:
return (ISC_R_NOTIMPLEMENTED);
}
}
/*
* Find the sort order of 'rdata' in the topology-like
* ACL forming the second element in a 2-element top-level
* sortlist statement.
*/
static int
query_sortlist_order_2element(const dns_rdata_t *rdata, const void *arg) {
isc_netaddr_t netaddr;
if (rdata_tonetaddr(rdata, &netaddr) != ISC_R_SUCCESS)
return (INT_MAX);
return (ns_sortlist_addrorder2(&netaddr, arg));
}
/*
* Find the sort order of 'rdata' in the matching element
* of a 1-element top-level sortlist statement.
*/
static int
query_sortlist_order_1element(const dns_rdata_t *rdata, const void *arg) {
isc_netaddr_t netaddr;
if (rdata_tonetaddr(rdata, &netaddr) != ISC_R_SUCCESS)
return (INT_MAX);
return (ns_sortlist_addrorder1(&netaddr, arg));
}
/*
* Find the sortlist statement that applies to 'client' and set up
* the sortlist info in in client->message appropriately.
*/
static void
setup_query_sortlist(ns_client_t *client) {
isc_netaddr_t netaddr;
dns_rdatasetorderfunc_t order = NULL;
const void *order_arg = NULL;
isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
switch (ns_sortlist_setup(client->view->sortlist,
&netaddr, &order_arg)) {
case NS_SORTLISTTYPE_1ELEMENT:
order = query_sortlist_order_1element;
break;
case NS_SORTLISTTYPE_2ELEMENT:
order = query_sortlist_order_2element;
break;
case NS_SORTLISTTYPE_NONE:
order = NULL;
break;
default:
INSIST(0);
break;
}
dns_message_setsortorder(client->message, order, order_arg);
}
static void
query_addnoqnameproof(ns_client_t *client, dns_rdataset_t *rdataset) {
isc_buffer_t *dbuf, b;
dns_name_t *fname;
dns_rdataset_t *neg, *negsig;
isc_result_t result = ISC_R_NOMEMORY;
CTRACE("query_addnoqnameproof");
fname = NULL;
neg = NULL;
negsig = NULL;
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
neg = query_newrdataset(client);
negsig = query_newrdataset(client);
if (fname == NULL || neg == NULL || negsig == NULL)
goto cleanup;
result = dns_rdataset_getnoqname(rdataset, fname, neg, negsig);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
query_addrrset(client, &fname, &neg, &negsig, dbuf,
DNS_SECTION_AUTHORITY);
if ((rdataset->attributes & DNS_RDATASETATTR_CLOSEST) == 0)
goto cleanup;
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
}
if (neg == NULL)
neg = query_newrdataset(client);
else if (dns_rdataset_isassociated(neg))
dns_rdataset_disassociate(neg);
if (negsig == NULL)
negsig = query_newrdataset(client);
else if (dns_rdataset_isassociated(negsig))
dns_rdataset_disassociate(negsig);
if (fname == NULL || neg == NULL || negsig == NULL)
goto cleanup;
result = dns_rdataset_getclosest(rdataset, fname, neg, negsig);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
query_addrrset(client, &fname, &neg, &negsig, dbuf,
DNS_SECTION_AUTHORITY);
cleanup:
if (neg != NULL)
query_putrdataset(client, &neg);
if (negsig != NULL)
query_putrdataset(client, &negsig);
if (fname != NULL)
query_releasename(client, &fname);
}
static inline void
answer_in_glue(ns_client_t *client, dns_rdatatype_t qtype) {
dns_name_t *name;
dns_message_t *msg;
dns_section_t section = DNS_SECTION_ADDITIONAL;
dns_rdataset_t *rdataset = NULL;
msg = client->message;
for (name = ISC_LIST_HEAD(msg->sections[section]);
name != NULL;
name = ISC_LIST_NEXT(name, link))
if (dns_name_equal(name, client->query.qname)) {
for (rdataset = ISC_LIST_HEAD(name->list);
rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link))
if (rdataset->type == qtype)
break;
break;
}
if (rdataset != NULL) {
ISC_LIST_UNLINK(msg->sections[section], name, link);
ISC_LIST_PREPEND(msg->sections[section], name, link);
ISC_LIST_UNLINK(name->list, rdataset, link);
ISC_LIST_PREPEND(name->list, rdataset, link);
rdataset->attributes |= DNS_RDATASETATTR_REQUIREDGLUE;
}
}
#define NS_NAME_INIT(A,B) \
{ \
DNS_NAME_MAGIC, \
A, sizeof(A), sizeof(B), \
DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE, \
B, NULL, { (void *)-1, (void *)-1}, \
{NULL, NULL} \
}
static unsigned char inaddr10_offsets[] = { 0, 3, 11, 16 };
static unsigned char inaddr172_offsets[] = { 0, 3, 7, 15, 20 };
static unsigned char inaddr192_offsets[] = { 0, 4, 8, 16, 21 };
static unsigned char inaddr10[] = "\00210\007IN-ADDR\004ARPA";
static unsigned char inaddr16172[] = "\00216\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr17172[] = "\00217\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr18172[] = "\00218\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr19172[] = "\00219\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr20172[] = "\00220\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr21172[] = "\00221\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr22172[] = "\00222\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr23172[] = "\00223\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr24172[] = "\00224\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr25172[] = "\00225\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr26172[] = "\00226\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr27172[] = "\00227\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr28172[] = "\00228\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr29172[] = "\00229\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr30172[] = "\00230\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr31172[] = "\00231\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr168192[] = "\003168\003192\007IN-ADDR\004ARPA";
static dns_name_t rfc1918names[] = {
NS_NAME_INIT(inaddr10, inaddr10_offsets),
NS_NAME_INIT(inaddr16172, inaddr172_offsets),
NS_NAME_INIT(inaddr17172, inaddr172_offsets),
NS_NAME_INIT(inaddr18172, inaddr172_offsets),
NS_NAME_INIT(inaddr19172, inaddr172_offsets),
NS_NAME_INIT(inaddr20172, inaddr172_offsets),
NS_NAME_INIT(inaddr21172, inaddr172_offsets),
NS_NAME_INIT(inaddr22172, inaddr172_offsets),
NS_NAME_INIT(inaddr23172, inaddr172_offsets),
NS_NAME_INIT(inaddr24172, inaddr172_offsets),
NS_NAME_INIT(inaddr25172, inaddr172_offsets),
NS_NAME_INIT(inaddr26172, inaddr172_offsets),
NS_NAME_INIT(inaddr27172, inaddr172_offsets),
NS_NAME_INIT(inaddr28172, inaddr172_offsets),
NS_NAME_INIT(inaddr29172, inaddr172_offsets),
NS_NAME_INIT(inaddr30172, inaddr172_offsets),
NS_NAME_INIT(inaddr31172, inaddr172_offsets),
NS_NAME_INIT(inaddr168192, inaddr192_offsets)
};
static unsigned char prisoner_data[] = "\010prisoner\004iana\003org";
static unsigned char hostmaster_data[] = "\012hostmaster\014root-servers\003org";
static unsigned char prisoner_offsets[] = { 0, 9, 14, 18 };
static unsigned char hostmaster_offsets[] = { 0, 11, 24, 28 };
static dns_name_t prisoner = NS_NAME_INIT(prisoner_data, prisoner_offsets);
static dns_name_t hostmaster = NS_NAME_INIT(hostmaster_data, hostmaster_offsets);
static void
warn_rfc1918(ns_client_t *client, dns_name_t *fname, dns_rdataset_t *rdataset) {
unsigned int i;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_soa_t soa;
dns_rdataset_t found;
isc_result_t result;
for (i = 0; i < (sizeof(rfc1918names)/sizeof(*rfc1918names)); i++) {
if (dns_name_issubdomain(fname, &rfc1918names[i])) {
dns_rdataset_init(&found);
result = dns_ncache_getrdataset(rdataset,
&rfc1918names[i],
dns_rdatatype_soa,
&found);
if (result != ISC_R_SUCCESS)
return;
result = dns_rdataset_first(&found);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(&found, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (dns_name_equal(&soa.origin, &prisoner) &&
dns_name_equal(&soa.contact, &hostmaster)) {
char buf[DNS_NAME_FORMATSIZE];
dns_name_format(fname, buf, sizeof(buf));
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"RFC 1918 response from "
"Internet for %s", buf);
}
dns_rdataset_disassociate(&found);
return;
}
}
}
static void
query_findclosestnsec3(dns_name_t *qname, dns_db_t *db,
dns_dbversion_t *version, ns_client_t *client,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
dns_name_t *fname, isc_boolean_t exact,
dns_name_t *found)
{
unsigned char salt[256];
size_t salt_length;
isc_uint16_t iterations;
isc_result_t result;
unsigned int dboptions;
dns_fixedname_t fixed;
dns_hash_t hash;
dns_name_t name;
int order;
unsigned int count;
dns_rdata_nsec3_t nsec3;
dns_rdata_t rdata = DNS_RDATA_INIT;
isc_boolean_t optout;
salt_length = sizeof(salt);
result = dns_db_getnsec3parameters(db, version, &hash, NULL,
&iterations, salt, &salt_length);
if (result != ISC_R_SUCCESS)
return;
dns_name_init(&name, NULL);
dns_name_clone(qname, &name);
/*
* Map unknown algorithm to known value.
*/
if (hash == DNS_NSEC3_UNKNOWNALG)
hash = 1;
again:
dns_fixedname_init(&fixed);
result = dns_nsec3_hashname(&fixed, NULL, NULL, &name,
dns_db_origin(db), hash,
iterations, salt, salt_length);
if (result != ISC_R_SUCCESS)
return;
dboptions = client->query.dboptions | DNS_DBFIND_FORCENSEC3;
result = dns_db_find(db, dns_fixedname_name(&fixed), version,
dns_rdatatype_nsec3, dboptions, client->now,
NULL, fname, rdataset, sigrdataset);
if (result == DNS_R_NXDOMAIN) {
if (!dns_rdataset_isassociated(rdataset)) {
return;
}
result = dns_rdataset_first(rdataset);
INSIST(result == ISC_R_SUCCESS);
dns_rdataset_current(rdataset, &rdata);
dns_rdata_tostruct(&rdata, &nsec3, NULL);
dns_rdata_reset(&rdata);
optout = ISC_TF((nsec3.flags & DNS_NSEC3FLAG_OPTOUT) != 0);
if (found != NULL && optout &&
dns_name_fullcompare(&name, dns_db_origin(db), &order,
&count) == dns_namereln_subdomain) {
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
count = dns_name_countlabels(&name) - 1;
dns_name_getlabelsequence(&name, 1, count, &name);
ns_client_log(client, DNS_LOGCATEGORY_DNSSEC,
NS_LOGMODULE_QUERY, ISC_LOG_DEBUG(3),
"looking for closest provable encloser");
goto again;
}
if (exact)
ns_client_log(client, DNS_LOGCATEGORY_DNSSEC,
NS_LOGMODULE_QUERY, ISC_LOG_WARNING,
"expected a exact match NSEC3, got "
"a covering record");
} else if (result != ISC_R_SUCCESS) {
return;
} else if (!exact)
ns_client_log(client, DNS_LOGCATEGORY_DNSSEC,
NS_LOGMODULE_QUERY, ISC_LOG_WARNING,
"expected covering NSEC3, got an exact match");
if (found != NULL)
dns_name_copy(&name, found, NULL);
return;
}
#ifdef ALLOW_FILTER_AAAA_ON_V4
static isc_boolean_t
is_v4_client(ns_client_t *client) {
if (isc_sockaddr_pf(&client->peeraddr) == AF_INET)
return (ISC_TRUE);
if (isc_sockaddr_pf(&client->peeraddr) == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&client->peeraddr.type.sin6.sin6_addr))
return (ISC_TRUE);
return (ISC_FALSE);
}
#endif
static isc_uint32_t
dns64_ttl(dns_db_t *db, dns_dbversion_t *version) {
dns_dbnode_t *node = NULL;
dns_rdata_soa_t soa;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_t rdataset;
isc_result_t result;
isc_uint32_t ttl = ISC_UINT32_MAX;
result = dns_db_getoriginnode(db, &node);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdataset_init(&rdataset);
result = dns_db_findrdataset(db, node, version, dns_rdatatype_soa,
0, 0, &rdataset, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_rdataset_first(&rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdataset_current(&rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
ttl = ISC_MIN(rdataset.ttl, soa.minimum);
cleanup:
if (dns_rdataset_isassociated(&rdataset))
dns_rdataset_disassociate(&rdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
return (ttl);
}
static isc_boolean_t
dns64_aaaaok(ns_client_t *client, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset)
{
isc_netaddr_t netaddr;
dns_dns64_t *dns64 = ISC_LIST_HEAD(client->view->dns64);
unsigned int flags = 0;
unsigned int i, count;
isc_boolean_t *aaaaok;
INSIST(client->query.dns64_aaaaok == NULL);
INSIST(client->query.dns64_aaaaoklen == 0);
INSIST(client->query.dns64_aaaa == NULL);
INSIST(client->query.dns64_sigaaaa == NULL);
if (dns64 == NULL)
return (ISC_TRUE);
if (RECURSIONOK(client))
flags |= DNS_DNS64_RECURSIVE;
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
flags |= DNS_DNS64_DNSSEC;
count = dns_rdataset_count(rdataset);
aaaaok = isc_mem_get(client->mctx, sizeof(isc_boolean_t) * count);
isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
if (dns_dns64_aaaaok(dns64, &netaddr, client->signer,
&ns_g_server->aclenv, flags, rdataset,
aaaaok, count)) {
for (i = 0; i < count; i++) {
if (aaaaok != NULL && !aaaaok[i]) {
client->query.dns64_aaaaok = aaaaok;
client->query.dns64_aaaaoklen = count;
break;
}
}
if (i == count && aaaaok != NULL)
isc_mem_put(client->mctx, aaaaok,
sizeof(isc_boolean_t) * count);
return (ISC_TRUE);
}
if (aaaaok != NULL)
isc_mem_put(client->mctx, aaaaok,
sizeof(isc_boolean_t) * count);
return (ISC_FALSE);
}
/*
* Look for the name and type in the redirection zone. If found update
* the arguments as appropriate. Return ISC_TRUE if a update was
* performed.
*
* Only perform the update if the client is in the allow query acl and
* returning the update would not cause a DNSSEC validation failure.
*/
static isc_boolean_t
redirect(ns_client_t *client, dns_name_t *name, dns_rdataset_t *rdataset,
dns_dbnode_t **nodep, dns_db_t **dbp, dns_rdatatype_t qtype)
{
dns_db_t *db = NULL;
dns_dbnode_t *node = NULL;
dns_fixedname_t fixed;
dns_name_t *found;
dns_rdataset_t trdataset;
isc_result_t result;
dns_rdatatype_t type;
CTRACE("redirect");
if (client->view->redirect == NULL)
return (ISC_FALSE);
dns_fixedname_init(&fixed);
found = dns_fixedname_name(&fixed);
dns_rdataset_init(&trdataset);
if (WANTDNSSEC(client) && dns_db_iszone(*dbp) && dns_db_issecure(*dbp))
return (ISC_FALSE);
if (WANTDNSSEC(client) && dns_rdataset_isassociated(rdataset)) {
if (rdataset->trust == dns_trust_secure)
return (ISC_FALSE);
if (rdataset->trust == dns_trust_ultimate &&
(rdataset->type == dns_rdatatype_nsec ||
rdataset->type == dns_rdatatype_nsec3))
return (ISC_FALSE);
if (rdataset->type == 0) {
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
dns_ncache_current(rdataset, found, &trdataset);
type = trdataset.type;
dns_rdataset_disassociate(&trdataset);
if (type == dns_rdatatype_nsec ||
type == dns_rdatatype_nsec3 ||
type == dns_rdatatype_rrsig)
return (ISC_FALSE);
}
}
}
result = ns_client_checkaclsilent(client, NULL,
dns_zone_getqueryacl(client->view->redirect),
ISC_TRUE);
if (result != ISC_R_SUCCESS)
return (ISC_FALSE);
result = dns_zone_getdb(client->view->redirect, &db);
if (result != ISC_R_SUCCESS)
return (ISC_FALSE);
/*
* Lookup the requested data in the redirect zone.
*/
result = dns_db_find(db, client->query.qname, NULL, qtype, 0,
client->now, &node, found, &trdataset, NULL);
if (result != ISC_R_SUCCESS) {
if (dns_rdataset_isassociated(&trdataset))
dns_rdataset_disassociate(&trdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
dns_db_detach(&db);
return (ISC_FALSE);
}
CTRACE("redirect: found data: done");
dns_name_copy(found, name, NULL);
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(&trdataset)) {
dns_rdataset_clone(&trdataset, rdataset);
dns_rdataset_disassociate(&trdataset);
}
if (*nodep != NULL)
dns_db_detachnode(*dbp, nodep);
dns_db_detach(dbp);
dns_db_attachnode(db, node, nodep);
dns_db_attach(db, dbp);
dns_db_detachnode(db, &node);
dns_db_detach(&db);
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
return (ISC_TRUE);
}
/*
* Do the bulk of query processing for the current query of 'client'.
* If 'event' is non-NULL, we are returning from recursion and 'qtype'
* is ignored. Otherwise, 'qtype' is the query type.
*/
static isc_result_t
query_find(ns_client_t *client, dns_fetchevent_t *event, dns_rdatatype_t qtype)
{
dns_db_t *db, *zdb;
dns_dbnode_t *node;
dns_rdatatype_t type;
dns_name_t *fname, *zfname, *tname, *prefix;
dns_rdataset_t *rdataset, *trdataset;
dns_rdataset_t *sigrdataset, *zrdataset, *zsigrdataset;
dns_rdataset_t **sigrdatasetp;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdatasetiter_t *rdsiter;
isc_boolean_t want_restart, authoritative, is_zone, need_wildcardproof;
isc_boolean_t is_staticstub_zone;
unsigned int n, nlabels;
dns_namereln_t namereln;
int order;
isc_buffer_t *dbuf;
isc_buffer_t b;
isc_result_t result, eresult;
dns_fixedname_t fixed;
dns_fixedname_t wildcardname;
dns_dbversion_t *version, *zversion;
dns_zone_t *zone;
dns_rdata_cname_t cname;
dns_rdata_dname_t dname;
unsigned int options;
isc_boolean_t empty_wild;
dns_rdataset_t *noqname;
dns_rpz_st_t *rpz_st;
isc_boolean_t resuming;
int line = -1;
isc_boolean_t dns64_exclude, dns64;
CTRACE("query_find");
/*
* One-time initialization.
*
* It's especially important to initialize anything that the cleanup
* code might cleanup.
*/
eresult = ISC_R_SUCCESS;
fname = NULL;
zfname = NULL;
rdataset = NULL;
zrdataset = NULL;
sigrdataset = NULL;
zsigrdataset = NULL;
zversion = NULL;
node = NULL;
db = NULL;
zdb = NULL;
version = NULL;
zone = NULL;
need_wildcardproof = ISC_FALSE;
empty_wild = ISC_FALSE;
dns64_exclude = dns64 = ISC_FALSE;
options = 0;
resuming = ISC_FALSE;
is_zone = ISC_FALSE;
is_staticstub_zone = ISC_FALSE;
if (event != NULL) {
/*
* We're returning from recursion. Restore the query context
* and resume.
*/
want_restart = ISC_FALSE;
rpz_st = client->query.rpz_st;
if (rpz_st != NULL &&
(rpz_st->state & DNS_RPZ_RECURSING) != 0) {
is_zone = rpz_st->q.is_zone;
authoritative = rpz_st->q.authoritative;
zone = rpz_st->q.zone;
rpz_st->q.zone = NULL;
node = rpz_st->q.node;
rpz_st->q.node = NULL;
db = rpz_st->q.db;
rpz_st->q.db = NULL;
rdataset = rpz_st->q.rdataset;
rpz_st->q.rdataset = NULL;
sigrdataset = rpz_st->q.sigrdataset;
rpz_st->q.sigrdataset = NULL;
qtype = rpz_st->q.qtype;
if (event->node != NULL)
dns_db_detachnode(db, &event->node);
rpz_st->ns.db = event->db;
rpz_st->ns.r_type = event->qtype;
rpz_st->ns.r_rdataset = event->rdataset;
if (event->sigrdataset != NULL &&
dns_rdataset_isassociated(event->sigrdataset))
dns_rdataset_disassociate(event->sigrdataset);
} else {
authoritative = ISC_FALSE;
qtype = event->qtype;
db = event->db;
node = event->node;
rdataset = event->rdataset;
sigrdataset = event->sigrdataset;
}
if (qtype == dns_rdatatype_rrsig || qtype == dns_rdatatype_sig)
type = dns_rdatatype_any;
else
type = qtype;
if (DNS64(client)) {
client->query.attributes &= ~NS_QUERYATTR_DNS64;
dns64 = ISC_TRUE;
}
if (DNS64EXCLUDE(client)) {
client->query.attributes &= ~NS_QUERYATTR_DNS64EXCLUDE;
dns64_exclude = ISC_TRUE;
}
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
if (fname == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
if (rpz_st != NULL &&
(rpz_st->state & DNS_RPZ_RECURSING) != 0) {
tname = rpz_st->fname;
} else {
tname = dns_fixedname_name(&event->foundname);
}
result = dns_name_copy(tname, fname, NULL);
if (result != ISC_R_SUCCESS) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
if (rpz_st != NULL &&
(rpz_st->state & DNS_RPZ_RECURSING) != 0) {
rpz_st->ns.r_result = event->result;
result = rpz_st->q.result;
isc_event_free(ISC_EVENT_PTR(&event));
} else {
result = event->result;
}
resuming = ISC_TRUE;
goto resume;
}
/*
* Not returning from recursion.
*/
/*
* If it's a SIG query, we'll iterate the node.
*/
if (qtype == dns_rdatatype_rrsig || qtype == dns_rdatatype_sig)
type = dns_rdatatype_any;
else
type = qtype;
restart:
CTRACE("query_find: restart");
want_restart = ISC_FALSE;
authoritative = ISC_FALSE;
version = NULL;
need_wildcardproof = ISC_FALSE;
if (client->view->checknames &&
!dns_rdata_checkowner(client->query.qname,
client->message->rdclass,
qtype, ISC_FALSE)) {
char namebuf[DNS_NAME_FORMATSIZE];
char typename[DNS_RDATATYPE_FORMATSIZE];
char classname[DNS_RDATACLASS_FORMATSIZE];
dns_name_format(client->query.qname, namebuf, sizeof(namebuf));
dns_rdatatype_format(qtype, typename, sizeof(typename));
dns_rdataclass_format(client->message->rdclass, classname,
sizeof(classname));
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY, ISC_LOG_ERROR,
"check-names failure %s/%s/%s", namebuf,
typename, classname);
QUERY_ERROR(DNS_R_REFUSED);
goto cleanup;
}
/*
* First we must find the right database.
*/
options &= DNS_GETDB_NOLOG; /* Preserve DNS_GETDB_NOLOG. */
if (dns_rdatatype_atparent(qtype) &&
!dns_name_equal(client->query.qname, dns_rootname))
options |= DNS_GETDB_NOEXACT;
result = query_getdb(client, client->query.qname, qtype, options,
&zone, &db, &version, &is_zone);
if ((result != ISC_R_SUCCESS || !is_zone) && !RECURSIONOK(client) &&
(options & DNS_GETDB_NOEXACT) != 0 && qtype == dns_rdatatype_ds) {
/*
* Look to see if we are authoritative for the
* child zone if the query type is DS.
*/
dns_db_t *tdb = NULL;
dns_zone_t *tzone = NULL;
dns_dbversion_t *tversion = NULL;
isc_result_t tresult;
tresult = query_getzonedb(client, client->query.qname, qtype,
DNS_GETDB_PARTIAL, &tzone, &tdb,
&tversion);
if (tresult == ISC_R_SUCCESS) {
options &= ~DNS_GETDB_NOEXACT;
query_putrdataset(client, &rdataset);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
version = tversion;
db = tdb;
zone = tzone;
is_zone = ISC_TRUE;
result = ISC_R_SUCCESS;
} else {
if (tdb != NULL)
dns_db_detach(&tdb);
if (tzone != NULL)
dns_zone_detach(&tzone);
}
}
if (result != ISC_R_SUCCESS) {
if (result == DNS_R_REFUSED) {
if (WANTRECURSION(client)) {
inc_stats(client,
dns_nsstatscounter_recurserej);
} else
inc_stats(client, dns_nsstatscounter_authrej);
if (!PARTIALANSWER(client))
QUERY_ERROR(DNS_R_REFUSED);
} else
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
is_staticstub_zone = ISC_FALSE;
if (is_zone) {
authoritative = ISC_TRUE;
if (zone != NULL &&
dns_zone_gettype(zone) == dns_zone_staticstub)
is_staticstub_zone = ISC_TRUE;
}
if (event == NULL && client->query.restarts == 0) {
if (is_zone) {
if (zone != NULL) {
/*
* if is_zone = true, zone = NULL then this is
* a DLZ zone. Don't attempt to attach zone.
*/
dns_zone_attach(zone, &client->query.authzone);
}
dns_db_attach(db, &client->query.authdb);
}
client->query.authdbset = ISC_TRUE;
}
db_find:
CTRACE("query_find: db_find");
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
rdataset = query_newrdataset(client);
if (fname == NULL || rdataset == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
if (WANTDNSSEC(client) && (!is_zone || dns_db_issecure(db))) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
/*
* Now look for an answer in the database.
*/
result = dns_db_find(db, client->query.qname, version, type,
client->query.dboptions, client->now,
&node, fname, rdataset, sigrdataset);
resume:
CTRACE("query_find: resume");
if (!ISC_LIST_EMPTY(client->view->rpz_zones) &&
RECURSIONOK(client) && !RECURSING(client) &&
result != DNS_R_DELEGATION && result != ISC_R_NOTFOUND &&
(client->query.rpz_st == NULL ||
(client->query.rpz_st->state & DNS_RPZ_REWRITTEN) == 0) &&
!dns_name_equal(client->query.qname, dns_rootname)) {
isc_result_t rresult;
rresult = rpz_rewrite(client, qtype, resuming);
rpz_st = client->query.rpz_st;
switch (rresult) {
case ISC_R_SUCCESS:
break;
case DNS_R_DELEGATION:
/*
* recursing for NS names or addresses,
* so save the main query state
*/
rpz_st->q.qtype = qtype;
rpz_st->q.is_zone = is_zone;
rpz_st->q.authoritative = authoritative;
rpz_st->q.zone = zone;
zone = NULL;
rpz_st->q.db = db;
db = NULL;
rpz_st->q.node = node;
node = NULL;
rpz_st->q.rdataset = rdataset;
rdataset = NULL;
rpz_st->q.sigrdataset = sigrdataset;
sigrdataset = NULL;
dns_name_copy(fname, rpz_st->fname, NULL);
rpz_st->q.result = result;
client->query.attributes |= NS_QUERYATTR_RECURSING;
goto cleanup;
default:
RECURSE_ERROR(rresult);
goto cleanup;
}
if (rpz_st->m.policy != DNS_RPZ_POLICY_MISS &&
rpz_st->m.policy != DNS_RPZ_POLICY_NO_OP) {
result = dns_name_copy(client->query.qname, fname,
NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
finish_rewrite:
rpz_clean(&zone, &db, &node, NULL);
if (rpz_st->m.rdataset != NULL) {
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
rdataset = rpz_st->m.rdataset;
rpz_st->m.rdataset = NULL;
} else if (rdataset != NULL &&
dns_rdataset_isassociated(rdataset)) {
dns_rdataset_disassociate(rdataset);
}
node = rpz_st->m.node;
rpz_st->m.node = NULL;
db = rpz_st->m.db;
rpz_st->m.db = NULL;
zone = rpz_st->m.zone;
rpz_st->m.zone = NULL;
result = rpz_st->m.result;
switch (rpz_st->m.policy) {
case DNS_RPZ_POLICY_NXDOMAIN:
result = DNS_R_NXDOMAIN;
break;
case DNS_RPZ_POLICY_NODATA:
result = DNS_R_NXRRSET;
break;
case DNS_RPZ_POLICY_RECORD:
if (type == dns_rdatatype_any &&
dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
break;
case DNS_RPZ_POLICY_CNAME:
result = dns_name_copy(&rpz_st->m.rpz->cname,
fname, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
query_keepname(client, fname, dbuf);
result = query_add_cname(client,
client->query.qname,
fname,
dns_trust_authanswer,
rpz_st->m.ttl);
if (result != ISC_R_SUCCESS)
goto cleanup;
ns_client_qnamereplace(client, fname);
fname = NULL;
client->attributes &= ~NS_CLIENTATTR_WANTDNSSEC;
rpz_log(client);
want_restart = ISC_TRUE;
goto cleanup;
default:
INSIST(0);
}
/*
* Turn off DNSSEC because the results of a
* response policy zone cannot verify.
*/
client->attributes &= ~NS_CLIENTATTR_WANTDNSSEC;
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
is_zone = ISC_TRUE;
rpz_log(client);
}
}
switch (result) {
case ISC_R_SUCCESS:
/*
* This case is handled in the main line below.
*/
break;
case DNS_R_GLUE:
case DNS_R_ZONECUT:
/*
* These cases are handled in the main line below.
*/
INSIST(is_zone);
authoritative = ISC_FALSE;
break;
case ISC_R_NOTFOUND:
/*
* The cache doesn't even have the root NS. Get them from
* the hints DB.
*/
INSIST(!is_zone);
if (db != NULL)
dns_db_detach(&db);
if (client->view->hints == NULL) {
/* We have no hints. */
result = ISC_R_FAILURE;
} else {
dns_db_attach(client->view->hints, &db);
result = dns_db_find(db, dns_rootname,
NULL, dns_rdatatype_ns,
0, client->now, &node, fname,
rdataset, sigrdataset);
}
if (result != ISC_R_SUCCESS) {
/*
* Nonsensical root hints may require cleanup.
*/
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
/*
* We don't have any root server hints, but
* we may have working forwarders, so try to
* recurse anyway.
*/
if (RECURSIONOK(client)) {
result = query_recurse(client, qtype,
client->query.qname,
NULL, NULL, resuming);
if (result == ISC_R_SUCCESS) {
client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (dns64)
client->query.attributes |=
NS_QUERYATTR_DNS64;
if (dns64_exclude)
client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else
RECURSE_ERROR(result);
goto cleanup;
} else {
/* Unable to give root server referral. */
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
/*
* XXXRTH We should trigger root server priming here.
*/
/* FALLTHROUGH */
case DNS_R_DELEGATION:
authoritative = ISC_FALSE;
if (is_zone) {
/*
* Look to see if we are authoritative for the
* child zone if the query type is DS.
*/
if (!RECURSIONOK(client) &&
(options & DNS_GETDB_NOEXACT) != 0 &&
qtype == dns_rdatatype_ds) {
dns_db_t *tdb = NULL;
dns_zone_t *tzone = NULL;
dns_dbversion_t *tversion = NULL;
result = query_getzonedb(client,
client->query.qname,
qtype,
DNS_GETDB_PARTIAL,
&tzone, &tdb,
&tversion);
if (result == ISC_R_SUCCESS) {
options &= ~DNS_GETDB_NOEXACT;
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client,
&sigrdataset);
if (fname != NULL)
query_releasename(client,
&fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
version = tversion;
db = tdb;
zone = tzone;
authoritative = ISC_TRUE;
goto db_find;
}
if (tdb != NULL)
dns_db_detach(&tdb);
if (tzone != NULL)
dns_zone_detach(&tzone);
}
/*
* We're authoritative for an ancestor of QNAME.
*/
if (!USECACHE(client) || !RECURSIONOK(client)) {
dns_fixedname_t fixed;
dns_fixedname_init(&fixed);
dns_name_copy(fname,
dns_fixedname_name(&fixed), NULL);
/*
* If we don't have a cache, this is the best
* answer.
*
* If the client is making a nonrecursive
* query we always give out the authoritative
* delegation. This way even if we get
* junk in our cache, we won't fail in our
* role as the delegating authority if another
* nameserver asks us about a delegated
* subzone.
*
* We enable the retrieval of glue for this
* database by setting client->query.gluedb.
*/
client->query.gluedb = db;
client->query.isreferral = ISC_TRUE;
/*
* We must ensure NOADDITIONAL is off,
* because the generation of
* additional data is required in
* delegations.
*/
client->query.attributes &=
~NS_QUERYATTR_NOADDITIONAL;
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
query_addrrset(client, &fname,
&rdataset, sigrdatasetp,
dbuf, DNS_SECTION_AUTHORITY);
client->query.gluedb = NULL;
if (WANTDNSSEC(client))
query_addds(client, db, node, version,
dns_fixedname_name(&fixed));
} else {
/*
* We might have a better answer or delegation
* in the cache. We'll remember the current
* values of fname, rdataset, and sigrdataset.
* We'll then go looking for QNAME in the
* cache. If we find something better, we'll
* use it instead.
*/
query_keepname(client, fname, dbuf);
zdb = db;
zfname = fname;
fname = NULL;
zrdataset = rdataset;
rdataset = NULL;
zsigrdataset = sigrdataset;
sigrdataset = NULL;
dns_db_detachnode(db, &node);
zversion = version;
version = NULL;
db = NULL;
dns_db_attach(client->view->cachedb, &db);
is_zone = ISC_FALSE;
goto db_find;
}
} else {
if (zfname != NULL &&
(!dns_name_issubdomain(fname, zfname) ||
(is_staticstub_zone &&
dns_name_equal(fname, zfname)))) {
/*
* In the following cases use "authoritative"
* data instead of the cache delegation:
* 1. We've already got a delegation from
* authoritative data, and it is better
* than what we found in the cache.
* 2. The query name matches the origin name
* of a static-stub zone. This needs to be
* considered for the case where the NS of
* the static-stub zone and the cached NS
* are different. We still need to contact
* the nameservers configured in the
* static-stub zone.
*/
query_releasename(client, &fname);
fname = zfname;
zfname = NULL;
/*
* We've already done query_keepname() on
* zfname, so we must set dbuf to NULL to
* prevent query_addrrset() from trying to
* call query_keepname() again.
*/
dbuf = NULL;
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client,
&sigrdataset);
rdataset = zrdataset;
zrdataset = NULL;
sigrdataset = zsigrdataset;
zsigrdataset = NULL;
version = zversion;
zversion = NULL;
/*
* We don't clean up zdb here because we
* may still need it. It will get cleaned
* up by the main cleanup code.
*/
}
if (RECURSIONOK(client)) {
/*
* Recurse!
*/
if (dns_rdatatype_atparent(type))
result = query_recurse(client, qtype,
client->query.qname,
NULL, NULL, resuming);
else if (dns64)
result = query_recurse(client,
dns_rdatatype_a,
client->query.qname,
NULL, NULL, resuming);
else
result = query_recurse(client, qtype,
client->query.qname,
fname, rdataset,
resuming);
if (result == ISC_R_SUCCESS) {
client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (dns64)
client->query.attributes |=
NS_QUERYATTR_DNS64;
if (dns64_exclude)
client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else if (result == DNS_R_DUPLICATE ||
result == DNS_R_DROP)
QUERY_ERROR(result);
else
RECURSE_ERROR(result);
} else {
dns_fixedname_t fixed;
dns_fixedname_init(&fixed);
dns_name_copy(fname,
dns_fixedname_name(&fixed), NULL);
/*
* This is the best answer.
*/
client->query.attributes |=
NS_QUERYATTR_CACHEGLUEOK;
client->query.gluedb = zdb;
client->query.isreferral = ISC_TRUE;
/*
* We must ensure NOADDITIONAL is off,
* because the generation of
* additional data is required in
* delegations.
*/
client->query.attributes &=
~NS_QUERYATTR_NOADDITIONAL;
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
query_addrrset(client, &fname,
&rdataset, sigrdatasetp,
dbuf, DNS_SECTION_AUTHORITY);
client->query.gluedb = NULL;
client->query.attributes &=
~NS_QUERYATTR_CACHEGLUEOK;
if (WANTDNSSEC(client))
query_addds(client, db, node, version,
dns_fixedname_name(&fixed));
}
}
goto cleanup;
case DNS_R_EMPTYNAME:
case DNS_R_NXRRSET:
nxrrset:
INSIST(is_zone);
#ifdef dns64_bis_return_excluded_addresses
if (dns64)
#else
if (dns64 && !dns64_exclude)
#endif
{
/*
* Restore the answers from the previous AAAA lookup.
*/
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
rdataset = client->query.dns64_aaaa;
sigrdataset = client->query.dns64_sigaaaa;
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
if (fname == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
dns_name_copy(client->query.qname, fname, NULL);
client->query.dns64_aaaa = NULL;
client->query.dns64_sigaaaa = NULL;
dns64 = ISC_FALSE;
#ifdef dns64_bis_return_excluded_addresses
/*
* Resume the diverted processing of the AAAA response?
*/
if (dns64_excluded)
break;
#endif
} else if (result == DNS_R_NXRRSET &&
!ISC_LIST_EMPTY(client->view->dns64) &&
client->message->rdclass == dns_rdataclass_in &&
qtype == dns_rdatatype_aaaa)
{
/*
* Look to see if there are A records for this
* name.
*/
INSIST(client->query.dns64_aaaa == NULL);
INSIST(client->query.dns64_sigaaaa == NULL);
client->query.dns64_aaaa = rdataset;
client->query.dns64_sigaaaa = sigrdataset;
client->query.dns64_ttl = dns64_ttl(db, version);
query_releasename(client, &fname);
dns_db_detachnode(db, &node);
rdataset = NULL;
sigrdataset = NULL;
type = qtype = dns_rdatatype_a;
dns64 = ISC_TRUE;
goto db_find;
}
/*
* Look for a NSEC3 record if we don't have a NSEC record.
*/
if (!dns_rdataset_isassociated(rdataset) &&
WANTDNSSEC(client)) {
if ((fname->attributes & DNS_NAMEATTR_WILDCARD) == 0) {
dns_name_t *found;
dns_name_t *qname;
dns_fixedname_init(&fixed);
found = dns_fixedname_name(&fixed);
qname = client->query.qname;
query_findclosestnsec3(qname, db, version,
client, rdataset,
sigrdataset, fname,
ISC_TRUE, found);
/*
* Did we find the closest provable encloser
* instead? If so add the nearest to the
* closest provable encloser.
*/
if (dns_rdataset_isassociated(rdataset) &&
!dns_name_equal(qname, found)) {
unsigned int count;
unsigned int skip;
/*
* Add the closest provable encloser.
*/
query_addrrset(client, &fname,
&rdataset, &sigrdataset,
dbuf,
DNS_SECTION_AUTHORITY);
count = dns_name_countlabels(found)
+ 1;
skip = dns_name_countlabels(qname) -
count;
dns_name_getlabelsequence(qname, skip,
count,
found);
fixfname(client, &fname, &dbuf, &b);
fixrdataset(client, &rdataset);
fixrdataset(client, &sigrdataset);
if (fname == NULL ||
rdataset == NULL ||
sigrdataset == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
/*
* 'nearest' doesn't exist so
* 'exist' is set to ISC_FALSE.
*/
query_findclosestnsec3(found, db,
version,
client,
rdataset,
sigrdataset,
fname,
ISC_FALSE,
NULL);
}
} else {
query_releasename(client, &fname);
query_addwildcardproof(client, db, version,
client->query.qname,
ISC_FALSE, ISC_TRUE);
}
}
if (dns_rdataset_isassociated(rdataset)) {
/*
* If we've got a NSEC record, we need to save the
* name now because we're going call query_addsoa()
* below, and it needs to use the name buffer.
*/
query_keepname(client, fname, dbuf);
} else if (fname != NULL) {
/*
* We're not going to use fname, and need to release
* our hold on the name buffer so query_addsoa()
* may use it.
*/
query_releasename(client, &fname);
}
/*
* Add SOA.
*/
result = query_addsoa(client, db, version, ISC_UINT32_MAX,
dns_rdataset_isassociated(rdataset));
if (result != ISC_R_SUCCESS) {
QUERY_ERROR(result);
goto cleanup;
}
/*
* Add NSEC record if we found one.
*/
if (WANTDNSSEC(client)) {
if (dns_rdataset_isassociated(rdataset))
query_addnxrrsetnsec(client, db, version,
&fname, &rdataset,
&sigrdataset);
}
goto cleanup;
case DNS_R_EMPTYWILD:
empty_wild = ISC_TRUE;
/* FALLTHROUGH */
case DNS_R_NXDOMAIN:
INSIST(is_zone);
if (!empty_wild &&
redirect(client, fname, rdataset, &node, &db, type))
break;
if (dns_rdataset_isassociated(rdataset)) {
/*
* If we've got a NSEC record, we need to save the
* name now because we're going call query_addsoa()
* below, and it needs to use the name buffer.
*/
query_keepname(client, fname, dbuf);
} else if (fname != NULL) {
/*
* We're not going to use fname, and need to release
* our hold on the name buffer so query_addsoa()
* may use it.
*/
query_releasename(client, &fname);
}
/*
* Add SOA. If the query was for a SOA record force the
* ttl to zero so that it is possible for clients to find
* the containing zone of an arbitrary name with a stub
* resolver and not have it cached.
*/
if (qtype == dns_rdatatype_soa &&
zone != NULL &&
dns_zone_getzeronosoattl(zone))
result = query_addsoa(client, db, version, 0,
dns_rdataset_isassociated(rdataset));
else
result = query_addsoa(client, db, version,
ISC_UINT32_MAX,
dns_rdataset_isassociated(rdataset));
if (result != ISC_R_SUCCESS) {
QUERY_ERROR(result);
goto cleanup;
}
if (WANTDNSSEC(client)) {
/*
* Add NSEC record if we found one.
*/
if (dns_rdataset_isassociated(rdataset))
query_addrrset(client, &fname, &rdataset,
&sigrdataset,
NULL, DNS_SECTION_AUTHORITY);
query_addwildcardproof(client, db, version,
client->query.qname, ISC_FALSE,
ISC_FALSE);
}
/*
* Set message rcode.
*/
if (empty_wild)
client->message->rcode = dns_rcode_noerror;
else
client->message->rcode = dns_rcode_nxdomain;
goto cleanup;
case DNS_R_NCACHENXDOMAIN:
if (redirect(client, fname, rdataset, &node, &db, type))
break;
case DNS_R_NCACHENXRRSET:
ncache_nxrrset:
INSIST(!is_zone);
authoritative = ISC_FALSE;
/*
* Set message rcode, if required.
*/
if (result == DNS_R_NCACHENXDOMAIN)
client->message->rcode = dns_rcode_nxdomain;
/*
* Look for RFC 1918 leakage from Internet.
*/
if (result == DNS_R_NCACHENXDOMAIN &&
qtype == dns_rdatatype_ptr &&
client->message->rdclass == dns_rdataclass_in &&
dns_name_countlabels(fname) == 7)
warn_rfc1918(client, fname, rdataset);
#ifdef dns64_bis_return_excluded_addresses
if (dns64)
#else
if (dns64 && !dns64_exclude)
#endif
{
/*
* Restore the answers from the previous AAAA lookup.
*/
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
rdataset = client->query.dns64_aaaa;
sigrdataset = client->query.dns64_sigaaaa;
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
if (fname == NULL) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
dns_name_copy(client->query.qname, fname, NULL);
client->query.dns64_aaaa = NULL;
client->query.dns64_sigaaaa = NULL;
dns64 = ISC_FALSE;
#ifdef dns64_bis_return_excluded_addresses
if (dns64_excluded)
break;
#endif
} else if (result == DNS_R_NCACHENXRRSET &&
!ISC_LIST_EMPTY(client->view->dns64) &&
client->message->rdclass == dns_rdataclass_in &&
qtype == dns_rdatatype_aaaa)
{
/*
* Look to see if there are A records for this
* name.
*/
INSIST(client->query.dns64_aaaa == NULL);
INSIST(client->query.dns64_sigaaaa == NULL);
client->query.dns64_aaaa = rdataset;
client->query.dns64_sigaaaa = sigrdataset;
/*
* If the ttl is zero we need to workout if we have just
* decremented to zero or if there was no negative cache
* ttl in the answer.
*/
if (rdataset->ttl != 0)
client->query.dns64_ttl = rdataset->ttl;
else if (dns_rdataset_first(rdataset) == ISC_R_SUCCESS)
client->query.dns64_ttl = 0;
query_releasename(client, &fname);
dns_db_detachnode(db, &node);
rdataset = NULL;
sigrdataset = NULL;
fname = NULL;
type = qtype = dns_rdatatype_a;
dns64 = ISC_TRUE;
goto db_find;
}
/*
* We don't call query_addrrset() because we don't need any
* of its extra features (and things would probably break!).
*/
query_keepname(client, fname, dbuf);
dns_message_addname(client->message, fname,
DNS_SECTION_AUTHORITY);
ISC_LIST_APPEND(fname->list, rdataset, link);
fname = NULL;
rdataset = NULL;
goto cleanup;
case DNS_R_CNAME:
/*
* Keep a copy of the rdataset. We have to do this because
* query_addrrset may clear 'rdataset' (to prevent the
* cleanup code from cleaning it up).
*/
trdataset = rdataset;
/*
* Add the CNAME to the answer section.
*/
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
if (WANTDNSSEC(client) &&
(fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
{
dns_fixedname_init(&wildcardname);
dns_name_copy(fname, dns_fixedname_name(&wildcardname),
NULL);
need_wildcardproof = ISC_TRUE;
}
if (NOQNAME(rdataset) && WANTDNSSEC(client))
noqname = rdataset;
else
noqname = NULL;
query_addrrset(client, &fname, &rdataset, sigrdatasetp, dbuf,
DNS_SECTION_ANSWER);
if (noqname != NULL)
query_addnoqnameproof(client, noqname);
/*
* We set the PARTIALANSWER attribute so that if anything goes
* wrong later on, we'll return what we've got so far.
*/
client->query.attributes |= NS_QUERYATTR_PARTIALANSWER;
/*
* Reset qname to be the target name of the CNAME and restart
* the query.
*/
tname = NULL;
result = dns_message_gettempname(client->message, &tname);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_rdataset_first(trdataset);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
dns_rdataset_current(trdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &cname, NULL);
dns_rdata_reset(&rdata);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
dns_name_init(tname, NULL);
result = dns_name_dup(&cname.cname, client->mctx, tname);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &tname);
dns_rdata_freestruct(&cname);
goto cleanup;
}
dns_rdata_freestruct(&cname);
ns_client_qnamereplace(client, tname);
want_restart = ISC_TRUE;
if (!WANTRECURSION(client))
options |= DNS_GETDB_NOLOG;
goto addauth;
case DNS_R_DNAME:
/*
* Compare the current qname to the found name. We need
* to know how many labels and bits are in common because
* we're going to have to split qname later on.
*/
namereln = dns_name_fullcompare(client->query.qname, fname,
&order, &nlabels);
INSIST(namereln == dns_namereln_subdomain);
/*
* Keep a copy of the rdataset. We have to do this because
* query_addrrset may clear 'rdataset' (to prevent the
* cleanup code from cleaning it up).
*/
trdataset = rdataset;
/*
* Add the DNAME to the answer section.
*/
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
if (WANTDNSSEC(client) &&
(fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
{
dns_fixedname_init(&wildcardname);
dns_name_copy(fname, dns_fixedname_name(&wildcardname),
NULL);
need_wildcardproof = ISC_TRUE;
}
query_addrrset(client, &fname, &rdataset, sigrdatasetp, dbuf,
DNS_SECTION_ANSWER);
/*
* We set the PARTIALANSWER attribute so that if anything goes
* wrong later on, we'll return what we've got so far.
*/
client->query.attributes |= NS_QUERYATTR_PARTIALANSWER;
/*
* Get the target name of the DNAME.
*/
tname = NULL;
result = dns_message_gettempname(client->message, &tname);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_rdataset_first(trdataset);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
dns_rdataset_current(trdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &dname, NULL);
dns_rdata_reset(&rdata);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
dns_name_clone(&dname.dname, tname);
dns_rdata_freestruct(&dname);
/*
* Construct the new qname consisting of
* <found name prefix>.<dname target>
*/
dns_fixedname_init(&fixed);
prefix = dns_fixedname_name(&fixed);
dns_name_split(client->query.qname, nlabels, prefix, NULL);
INSIST(fname == NULL);
dbuf = query_getnamebuf(client);
if (dbuf == NULL) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
if (fname == NULL) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
result = dns_name_concatenate(prefix, tname, fname, NULL);
dns_message_puttempname(client->message, &tname);
/*
* RFC2672, section 4.1, subsection 3c says
* we should return YXDOMAIN if the constructed
* name would be too long.
*/
if (result == DNS_R_NAMETOOLONG)
client->message->rcode = dns_rcode_yxdomain;
if (result != ISC_R_SUCCESS)
goto cleanup;
query_keepname(client, fname, dbuf);
/*
* Synthesize a CNAME consisting of
* <old qname> <dname ttl> CNAME <new qname>
* with <dname trust value>
*
* Synthesize a CNAME so old old clients that don't understand
* DNAME can chain.
*
* We do not try to synthesize a signature because we hope
* that security aware servers will understand DNAME. Also,
* even if we had an online key, making a signature
* on-the-fly is costly, and not really legitimate anyway
* since the synthesized CNAME is NOT in the zone.
*/
result = query_add_cname(client, client->query.qname, fname,
trdataset->trust, trdataset->ttl);
if (result != ISC_R_SUCCESS)
goto cleanup;
/*
* Switch to the new qname and restart.
*/
ns_client_qnamereplace(client, fname);
fname = NULL;
want_restart = ISC_TRUE;
if (!WANTRECURSION(client))
options |= DNS_GETDB_NOLOG;
goto addauth;
default:
/*
* Something has gone wrong.
*/
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
if (WANTDNSSEC(client) &&
(fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
{
dns_fixedname_init(&wildcardname);
dns_name_copy(fname, dns_fixedname_name(&wildcardname), NULL);
need_wildcardproof = ISC_TRUE;
}
if (type == dns_rdatatype_any) {
#ifdef ALLOW_FILTER_AAAA_ON_V4
isc_boolean_t have_aaaa, have_a, have_sig, filter_aaaa;
/*
* The filter-aaaa-on-v4 option should
* suppress AAAAs for IPv4 clients if there is an A.
* If we are not authoritative, assume there is a A
* even in if it is not in our cache. This assumption could
* be wrong but it is a good bet.
*/
have_aaaa = ISC_FALSE;
have_a = !authoritative;
have_sig = ISC_FALSE;
if (client->view->v4_aaaa != dns_v4_aaaa_ok &&
is_v4_client(client) &&
ns_client_checkaclsilent(client, NULL,
client->view->v4_aaaa_acl,
ISC_TRUE) == ISC_R_SUCCESS)
filter_aaaa = ISC_TRUE;
else
filter_aaaa = ISC_FALSE;
#endif
/*
* XXXRTH Need to handle zonecuts with special case
* code.
*/
n = 0;
rdsiter = NULL;
result = dns_db_allrdatasets(db, node, version, 0, &rdsiter);
if (result != ISC_R_SUCCESS) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
/*
* Check all A and AAAA records in all response policy
* IP address zones
*/
rpz_st = client->query.rpz_st;
if (rpz_st != NULL &&
(rpz_st->state & DNS_RPZ_DONE_QNAME) != 0 &&
(rpz_st->state & DNS_RPZ_REWRITTEN) == 0 &&
RECURSIONOK(client) && !RECURSING(client) &&
(rpz_st->state & DNS_RPZ_HAVE_IP) != 0) {
for (result = dns_rdatasetiter_first(rdsiter);
result == ISC_R_SUCCESS;
result = dns_rdatasetiter_next(rdsiter)) {
dns_rdatasetiter_current(rdsiter, rdataset);
if (rdataset->type == dns_rdatatype_a ||
rdataset->type == dns_rdatatype_aaaa)
result = rpz_rewrite_ip(client,
rdataset,
DNS_RPZ_TYPE_IP);
dns_rdataset_disassociate(rdataset);
if (result != ISC_R_SUCCESS)
break;
}
if (result != ISC_R_NOMORE) {
dns_rdatasetiter_destroy(&rdsiter);
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
switch (rpz_st->m.policy) {
case DNS_RPZ_POLICY_MISS:
break;
case DNS_RPZ_POLICY_NO_OP:
rpz_log(client);
rpz_st->state |= DNS_RPZ_REWRITTEN;
break;
case DNS_RPZ_POLICY_NXDOMAIN:
case DNS_RPZ_POLICY_NODATA:
case DNS_RPZ_POLICY_RECORD:
case DNS_RPZ_POLICY_CNAME:
dns_rdatasetiter_destroy(&rdsiter);
rpz_st->state |= DNS_RPZ_REWRITTEN;
goto finish_rewrite;
default:
INSIST(0);
}
}
/*
* Calling query_addrrset() with a non-NULL dbuf is going
* to either keep or release the name. We don't want it to
* release fname, since we may have to call query_addrrset()
* more than once. That means we have to call query_keepname()
* now, and pass a NULL dbuf to query_addrrset().
*
* If we do a query_addrrset() below, we must set fname to
* NULL before leaving this block, otherwise we might try to
* cleanup fname even though we're using it!
*/
query_keepname(client, fname, dbuf);
tname = fname;
result = dns_rdatasetiter_first(rdsiter);
while (result == ISC_R_SUCCESS) {
dns_rdatasetiter_current(rdsiter, rdataset);
#ifdef ALLOW_FILTER_AAAA_ON_V4
/*
* Notice the presence of A and AAAAs so
* that AAAAs can be hidden from IPv4 clients.
*/
if (filter_aaaa) {
if (rdataset->type == dns_rdatatype_aaaa)
have_aaaa = ISC_TRUE;
else if (rdataset->type == dns_rdatatype_a)
have_a = ISC_TRUE;
}
#endif
if (is_zone && qtype == dns_rdatatype_any &&
!dns_db_issecure(db) &&
dns_rdatatype_isdnssec(rdataset->type)) {
/*
* The zone is transitioning from insecure
* to secure. Hide the dnssec records from
* ANY queries.
*/
dns_rdataset_disassociate(rdataset);
} else if ((qtype == dns_rdatatype_any ||
rdataset->type == qtype) && rdataset->type != 0) {
#ifdef ALLOW_FILTER_AAAA_ON_V4
if (dns_rdatatype_isdnssec(rdataset->type))
have_sig = ISC_TRUE;
#endif
if (NOQNAME(rdataset) && WANTDNSSEC(client))
noqname = rdataset;
else
noqname = NULL;
query_addrrset(client,
fname != NULL ? &fname : &tname,
&rdataset, NULL,
NULL, DNS_SECTION_ANSWER);
if (noqname != NULL)
query_addnoqnameproof(client, noqname);
n++;
INSIST(tname != NULL);
/*
* rdataset is non-NULL only in certain
* pathological cases involving DNAMEs.
*/
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
rdataset = query_newrdataset(client);
if (rdataset == NULL)
break;
} else {
/*
* We're not interested in this rdataset.
*/
dns_rdataset_disassociate(rdataset);
}
result = dns_rdatasetiter_next(rdsiter);
}
#ifdef ALLOW_FILTER_AAAA_ON_V4
/*
* Filter AAAAs if there is an A and there is no signature
* or we are supposed to break DNSSEC.
*/
if (filter_aaaa && have_aaaa && have_a &&
(!have_sig || !WANTDNSSEC(client) ||
client->view->v4_aaaa == dns_v4_aaaa_break_dnssec))
client->attributes |= NS_CLIENTATTR_FILTER_AAAA;
#endif
if (fname != NULL)
dns_message_puttempname(client->message, &fname);
if (n == 0 && is_zone) {
/*
* We didn't match any rdatasets.
*/
if ((qtype == dns_rdatatype_rrsig ||
qtype == dns_rdatatype_sig) &&
result == ISC_R_NOMORE) {
/*
* XXXRTH If this is a secure zone and we
* didn't find any SIGs, we should generate
* an error unless we were searching for
* glue. Ugh.
*/
if (!is_zone) {
/*
* Note: this is dead code because
* is_zone is always true due to the
* condition above. But naive
* recursion would cause infinite
* attempts of recursion because
* the answer to (RR)SIG queries
* won't be cached. Until we figure
* out what we should do and implement
* it we intentionally keep this code
* dead.
*/
authoritative = ISC_FALSE;
dns_rdatasetiter_destroy(&rdsiter);
if (RECURSIONOK(client)) {
result = query_recurse(client,
qtype,
client->query.qname,
NULL, NULL,
resuming);
if (result == ISC_R_SUCCESS)
client->query.attributes |=
NS_QUERYATTR_RECURSING;
else
RECURSE_ERROR(result);
}
goto addauth;
}
/*
* We were searching for SIG records in
* a nonsecure zone. Send a "no error,
* no data" response.
*/
/*
* Add SOA.
*/
result = query_addsoa(client, db, version,
ISC_UINT32_MAX,
ISC_FALSE);
if (result == ISC_R_SUCCESS)
result = ISC_R_NOMORE;
} else {
/*
* Something went wrong.
*/
result = DNS_R_SERVFAIL;
}
}
dns_rdatasetiter_destroy(&rdsiter);
if (result != ISC_R_NOMORE) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
} else {
/*
* This is the "normal" case -- an ordinary question to which
* we know the answer.
*/
/*
* Check all A and AAAA records in all response policy
* IP address zones
*/
rpz_st = client->query.rpz_st;
if (rpz_st != NULL &&
(rpz_st->state & DNS_RPZ_DONE_QNAME) != 0 &&
(rpz_st->state & DNS_RPZ_REWRITTEN) == 0 &&
RECURSIONOK(client) && !RECURSING(client) &&
(rpz_st->state & DNS_RPZ_HAVE_IP) != 0 &&
(qtype == dns_rdatatype_aaaa || qtype == dns_rdatatype_a)) {
result = rpz_rewrite_ip(client, rdataset,
DNS_RPZ_TYPE_IP);
if (result != ISC_R_SUCCESS) {
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
/*
* After a hit in the radix tree for the policy domain,
* either stop trying to rewrite (DNS_RPZ_POLICY_NO_OP)
* or restart to ask the ordinary database of the
* policy zone for the DNS record corresponding to the
* record in the radix tree.
*/
switch (rpz_st->m.policy) {
case DNS_RPZ_POLICY_MISS:
break;
case DNS_RPZ_POLICY_NO_OP:
rpz_log(client);
rpz_st->state |= DNS_RPZ_REWRITTEN;
break;
case DNS_RPZ_POLICY_NXDOMAIN:
case DNS_RPZ_POLICY_NODATA:
case DNS_RPZ_POLICY_RECORD:
case DNS_RPZ_POLICY_CNAME:
rpz_st->state |= DNS_RPZ_REWRITTEN;
goto finish_rewrite;
default:
INSIST(0);
}
}
#ifdef ALLOW_FILTER_AAAA_ON_V4
/*
* Optionally hide AAAAs from IPv4 clients if there is an A.
* We add the AAAAs now, but might refuse to render them later
* after DNSSEC is figured out.
* This could be more efficient, but the whole idea is
* so fundamentally wrong, unavoidably inaccurate, and
* unneeded that it is best to keep it as short as possible.
*/
if (client->view->v4_aaaa != dns_v4_aaaa_ok &&
is_v4_client(client) &&
ns_client_checkaclsilent(client, NULL,
client->view->v4_aaaa_acl,
ISC_TRUE) == ISC_R_SUCCESS &&
(!WANTDNSSEC(client) ||
sigrdataset == NULL ||
!dns_rdataset_isassociated(sigrdataset) ||
client->view->v4_aaaa == dns_v4_aaaa_break_dnssec)) {
if (qtype == dns_rdatatype_aaaa) {
trdataset = query_newrdataset(client);
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_a, 0,
client->now,
trdataset, NULL);
if (dns_rdataset_isassociated(trdataset))
dns_rdataset_disassociate(trdataset);
query_putrdataset(client, &trdataset);
/*
* We have an AAAA but the A is not in our cache.
* Assume any result other than DNS_R_DELEGATION
* or ISC_R_NOTFOUND means there is no A and
* so AAAAs are ok.
* Assume there is no A if we can't recurse
* for this client, although that could be
* the wrong answer. What else can we do?
* Besides, that we have the AAAA and are using
* this mechanism suggests that we care more
* about As than AAAAs and would have cached
* the A if it existed.
*/
if (result == ISC_R_SUCCESS) {
client->attributes |=
NS_CLIENTATTR_FILTER_AAAA;
} else if (authoritative ||
!RECURSIONOK(client) ||
(result != DNS_R_DELEGATION &&
result != ISC_R_NOTFOUND)) {
client->attributes &=
~NS_CLIENTATTR_FILTER_AAAA;
} else {
/*
* This is an ugly kludge to recurse
* for the A and discard the result.
*
* Continue to add the AAAA now.
* We'll make a note to not render it
* if the recursion for the A succeeds.
*/
result = query_recurse(client,
dns_rdatatype_a,
client->query.qname,
NULL, NULL, resuming);
if (result == ISC_R_SUCCESS) {
client->attributes |=
NS_CLIENTATTR_FILTER_AAAA_RC;
client->query.attributes |=
NS_QUERYATTR_RECURSING;
}
}
} else if (qtype == dns_rdatatype_a &&
(client->attributes &
NS_CLIENTATTR_FILTER_AAAA_RC) != 0) {
client->attributes &=
~NS_CLIENTATTR_FILTER_AAAA_RC;
client->attributes |=
NS_CLIENTATTR_FILTER_AAAA;
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
goto cleanup;
}
}
#endif
/*
* Check to see if the AAAA RRset has non-excluded addresses
* in it. If not look for a A RRset.
*/
INSIST(client->query.dns64_aaaaok == NULL);
if (qtype == dns_rdatatype_aaaa && !dns64_exclude &&
!ISC_LIST_EMPTY(client->view->dns64) &&
client->message->rdclass == dns_rdataclass_in &&
!dns64_aaaaok(client, rdataset, sigrdataset)) {
/*
* Look to see if there are A records for this
* name.
*/
client->query.dns64_aaaa = rdataset;
client->query.dns64_sigaaaa = sigrdataset;
client->query.dns64_ttl = rdataset->ttl;
query_releasename(client, &fname);
dns_db_detachnode(db, &node);
rdataset = NULL;
sigrdataset = NULL;
type = qtype = dns_rdatatype_a;
dns64_exclude = dns64 = ISC_TRUE;
goto db_find;
}
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
if (NOQNAME(rdataset) && WANTDNSSEC(client))
noqname = rdataset;
else
noqname = NULL;
/*
* BIND 8 priming queries need the additional section.
*/
if (is_zone && qtype == dns_rdatatype_ns &&
dns_name_equal(client->query.qname, dns_rootname))
client->query.attributes &= ~NS_QUERYATTR_NOADDITIONAL;
if (dns64) {
qtype = type = dns_rdatatype_aaaa;
result = query_dns64(client, &fname, rdataset,
sigrdataset, dbuf,
DNS_SECTION_ANSWER);
dns_rdataset_disassociate(rdataset);
dns_message_puttemprdataset(client->message, &rdataset);
if (result == ISC_R_NOMORE) {
#ifndef dns64_bis_return_excluded_addresses
if (dns64_exclude) {
if (!is_zone)
goto cleanup;
/*
* Add a fake SOA record.
*/
(void)query_addsoa(client, db, version,
600, ISC_FALSE);
goto cleanup;
}
#endif
if (is_zone)
goto nxrrset;
else
goto ncache_nxrrset;
} else if (result != ISC_R_SUCCESS) {
eresult = result;
goto cleanup;
}
} else if (client->query.dns64_aaaaok != NULL) {
query_filter64(client, &fname, rdataset, dbuf,
DNS_SECTION_ANSWER);
query_putrdataset(client, &rdataset);
} else
query_addrrset(client, &fname, &rdataset,
sigrdatasetp, dbuf, DNS_SECTION_ANSWER);
if (noqname != NULL)
query_addnoqnameproof(client, noqname);
/*
* We shouldn't ever fail to add 'rdataset'
* because it's already in the answer.
*/
INSIST(rdataset == NULL);
}
addauth:
CTRACE("query_find: addauth");
/*
* Add NS records to the authority section (if we haven't already
* added them to the answer section).
*/
if (!want_restart && !NOAUTHORITY(client)) {
if (is_zone) {
if (!((qtype == dns_rdatatype_ns ||
qtype == dns_rdatatype_any) &&
dns_name_equal(client->query.qname,
dns_db_origin(db))))
(void)query_addns(client, db, version);
} else if (qtype != dns_rdatatype_ns) {
if (fname != NULL)
query_releasename(client, &fname);
query_addbestns(client);
}
}
/*
* Add NSEC records to the authority section if they're needed for
* DNSSEC wildcard proofs.
*/
if (need_wildcardproof && dns_db_issecure(db))
query_addwildcardproof(client, db, version,
dns_fixedname_name(&wildcardname),
ISC_TRUE, ISC_FALSE);
cleanup:
CTRACE("query_find: cleanup");
/*
* General cleanup.
*/
rpz_st = client->query.rpz_st;
if (rpz_st != NULL && (rpz_st->state & DNS_RPZ_RECURSING) == 0)
rpz_clean(&rpz_st->m.zone, &rpz_st->m.db, &rpz_st->m.node,
&rpz_st->m.rdataset);
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
if (zdb != NULL) {
query_putrdataset(client, &zrdataset);
if (zsigrdataset != NULL)
query_putrdataset(client, &zsigrdataset);
if (zfname != NULL)
query_releasename(client, &zfname);
dns_db_detach(&zdb);
}
if (event != NULL)
isc_event_free(ISC_EVENT_PTR(&event));
/*
* AA bit.
*/
if (client->query.restarts == 0 && !authoritative) {
/*
* We're not authoritative, so we must ensure the AA bit
* isn't set.
*/
client->message->flags &= ~DNS_MESSAGEFLAG_AA;
}
/*
* Restart the query?
*/
if (want_restart && client->query.restarts < MAX_RESTARTS) {
client->query.restarts++;
goto restart;
}
if (eresult != ISC_R_SUCCESS &&
(!PARTIALANSWER(client) || WANTRECURSION(client))) {
if (eresult == DNS_R_DUPLICATE || eresult == DNS_R_DROP) {
/*
* This was a duplicate query that we are
* recursing on. Don't send a response now.
* The original query will still cause a response.
*/
query_next(client, eresult);
} else {
/*
* If we don't have any answer to give the client,
* or if the client requested recursion and thus wanted
* the complete answer, send an error response.
*/
INSIST(line >= 0);
query_error(client, eresult, line);
}
ns_client_detach(&client);
} else if (!RECURSING(client)) {
/*
* We are done. Set up sortlist data for the message
* rendering code, make a final tweak to the AA bit if the
* auth-nxdomain config option says so, then render and
* send the response.
*/
setup_query_sortlist(client);
/*
* If this is a referral and the answer to the question
* is in the glue sort it to the start of the additional
* section.
*/
if (ISC_LIST_EMPTY(client->message->sections[DNS_SECTION_ANSWER]) &&
client->message->rcode == dns_rcode_noerror &&
(qtype == dns_rdatatype_a || qtype == dns_rdatatype_aaaa))
answer_in_glue(client, qtype);
if (client->message->rcode == dns_rcode_nxdomain &&
client->view->auth_nxdomain == ISC_TRUE)
client->message->flags |= DNS_MESSAGEFLAG_AA;
/*
* If the response is somehow unexpected for the client and this
* is a result of recursion, return an error to the caller
* to indicate it may need to be logged.
*/
if (resuming &&
(ISC_LIST_EMPTY(client->message->sections[DNS_SECTION_ANSWER]) ||
client->message->rcode != dns_rcode_noerror))
eresult = ISC_R_FAILURE;
query_send(client);
ns_client_detach(&client);
}
CTRACE("query_find: done");
return (eresult);
}
static inline void
log_query(ns_client_t *client, unsigned int flags, unsigned int extflags) {
char namebuf[DNS_NAME_FORMATSIZE];
char typename[DNS_RDATATYPE_FORMATSIZE];
char classname[DNS_RDATACLASS_FORMATSIZE];
char onbuf[ISC_NETADDR_FORMATSIZE];
dns_rdataset_t *rdataset;
int level = ISC_LOG_INFO;
if (! isc_log_wouldlog(ns_g_lctx, level))
return;
rdataset = ISC_LIST_HEAD(client->query.qname->list);
INSIST(rdataset != NULL);
dns_name_format(client->query.qname, namebuf, sizeof(namebuf));
dns_rdataclass_format(rdataset->rdclass, classname, sizeof(classname));
dns_rdatatype_format(rdataset->type, typename, sizeof(typename));
isc_netaddr_format(&client->destaddr, onbuf, sizeof(onbuf));
ns_client_log(client, NS_LOGCATEGORY_QUERIES, NS_LOGMODULE_QUERY,
level, "query: %s %s %s %s%s%s%s%s%s (%s)", namebuf,
classname, typename, WANTRECURSION(client) ? "+" : "-",
(client->signer != NULL) ? "S": "",
(client->opt != NULL) ? "E" : "",
((client->attributes & NS_CLIENTATTR_TCP) != 0) ?
"T" : "",
((extflags & DNS_MESSAGEEXTFLAG_DO) != 0) ? "D" : "",
((flags & DNS_MESSAGEFLAG_CD) != 0) ? "C" : "",
onbuf);
}
static inline void
log_queryerror(ns_client_t *client, isc_result_t result, int line, int level) {
char namebuf[DNS_NAME_FORMATSIZE];
char typename[DNS_RDATATYPE_FORMATSIZE];
char classname[DNS_RDATACLASS_FORMATSIZE];
const char *namep, *typep, *classp, *sep1, *sep2;
dns_rdataset_t *rdataset;
if (!isc_log_wouldlog(ns_g_lctx, level))
return;
namep = typep = classp = sep1 = sep2 = "";
/*
* Query errors can happen for various reasons. In some cases we cannot
* even assume the query contains a valid question section, so we should
* expect exceptional cases.
*/
if (client->query.origqname != NULL) {
dns_name_format(client->query.origqname, namebuf,
sizeof(namebuf));
namep = namebuf;
sep1 = " for ";
rdataset = ISC_LIST_HEAD(client->query.origqname->list);
if (rdataset != NULL) {
dns_rdataclass_format(rdataset->rdclass, classname,
sizeof(classname));
classp = classname;
dns_rdatatype_format(rdataset->type, typename,
sizeof(typename));
typep = typename;
sep2 = "/";
}
}
ns_client_log(client, NS_LOGCATEGORY_QUERY_EERRORS, NS_LOGMODULE_QUERY,
level, "query failed (%s)%s%s%s%s%s%s at %s:%d",
isc_result_totext(result), sep1, namep, sep2,
classp, sep2, typep, __FILE__, line);
}
void
ns_query_start(ns_client_t *client) {
isc_result_t result;
dns_message_t *message = client->message;
dns_rdataset_t *rdataset;
ns_client_t *qclient;
dns_rdatatype_t qtype;
unsigned int saved_extflags = client->extflags;
unsigned int saved_flags = client->message->flags;
isc_boolean_t want_ad;
CTRACE("ns_query_start");
/*
* Test only.
*/
if (ns_g_clienttest && (client->attributes & NS_CLIENTATTR_TCP) == 0)
RUNTIME_CHECK(ns_client_replace(client) == ISC_R_SUCCESS);
/*
* Ensure that appropriate cleanups occur.
*/
client->next = query_next_callback;
/*
* Behave as if we don't support DNSSEC if not enabled.
*/
if (!client->view->enablednssec) {
message->flags &= ~DNS_MESSAGEFLAG_CD;
client->extflags &= ~DNS_MESSAGEEXTFLAG_DO;
if (client->opt != NULL)
client->opt->ttl &= ~DNS_MESSAGEEXTFLAG_DO;
}
if ((message->flags & DNS_MESSAGEFLAG_RD) != 0)
client->query.attributes |= NS_QUERYATTR_WANTRECURSION;
if ((client->extflags & DNS_MESSAGEEXTFLAG_DO) != 0)
client->attributes |= NS_CLIENTATTR_WANTDNSSEC;
if (client->view->minimalresponses)
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
if ((client->view->cachedb == NULL)
|| (!client->view->additionalfromcache)) {
/*
* We don't have a cache. Turn off cache support and
* recursion.
*/
client->query.attributes &=
~(NS_QUERYATTR_RECURSIONOK|NS_QUERYATTR_CACHEOK);
} else if ((client->attributes & NS_CLIENTATTR_RA) == 0 ||
(message->flags & DNS_MESSAGEFLAG_RD) == 0) {
/*
* If the client isn't allowed to recurse (due to
* "recursion no", the allow-recursion ACL, or the
* lack of a resolver in this view), or if it
* doesn't want recursion, turn recursion off.
*/
client->query.attributes &= ~NS_QUERYATTR_RECURSIONOK;
}
/*
* Get the question name.
*/
result = dns_message_firstname(message, DNS_SECTION_QUESTION);
if (result != ISC_R_SUCCESS) {
query_error(client, result, __LINE__);
return;
}
dns_message_currentname(message, DNS_SECTION_QUESTION,
&client->query.qname);
client->query.origqname = client->query.qname;
result = dns_message_nextname(message, DNS_SECTION_QUESTION);
if (result != ISC_R_NOMORE) {
if (result == ISC_R_SUCCESS) {
/*
* There's more than one QNAME in the question
* section.
*/
query_error(client, DNS_R_FORMERR, __LINE__);
} else
query_error(client, result, __LINE__);
return;
}
if (ns_g_server->log_queries)
log_query(client, saved_flags, saved_extflags);
/*
* Check for multiple question queries, since edns1 is dead.
*/
if (message->counts[DNS_SECTION_QUESTION] > 1) {
query_error(client, DNS_R_FORMERR, __LINE__);
return;
}
/*
* Check for meta-queries like IXFR and AXFR.
*/
rdataset = ISC_LIST_HEAD(client->query.qname->list);
INSIST(rdataset != NULL);
qtype = rdataset->type;
dns_rdatatypestats_increment(ns_g_server->rcvquerystats, qtype);
if (dns_rdatatype_ismeta(qtype)) {
switch (qtype) {
case dns_rdatatype_any:
break; /* Let query_find handle it. */
case dns_rdatatype_ixfr:
case dns_rdatatype_axfr:
ns_xfr_start(client, rdataset->type);
return;
case dns_rdatatype_maila:
case dns_rdatatype_mailb:
query_error(client, DNS_R_NOTIMP, __LINE__);
return;
case dns_rdatatype_tkey:
result = dns_tkey_processquery(client->message,
ns_g_server->tkeyctx,
client->view->dynamickeys);
if (result == ISC_R_SUCCESS)
query_send(client);
else
query_error(client, result, __LINE__);
return;
default: /* TSIG, etc. */
query_error(client, DNS_R_FORMERR, __LINE__);
return;
}
}
/*
* Turn on minimal response for DNSKEY and DS queries.
*/
if (qtype == dns_rdatatype_dnskey || qtype == dns_rdatatype_ds)
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
/*
* Turn on minimal responses for EDNS/UDP bufsize 512 queries.
*/
if (client->opt != NULL && client->udpsize <= 512U &&
(client->attributes & NS_CLIENTATTR_TCP) == 0)
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
/*
* If the client has requested that DNSSEC checking be disabled,
* allow lookups to return pending data and instruct the resolver
* to return data before validation has completed.
*
* We don't need to set DNS_DBFIND_PENDINGOK when validation is
* disabled as there will be no pending data.
*/
if (message->flags & DNS_MESSAGEFLAG_CD ||
qtype == dns_rdatatype_rrsig)
{
client->query.dboptions |= DNS_DBFIND_PENDINGOK;
client->query.fetchoptions |= DNS_FETCHOPT_NOVALIDATE;
} else if (!client->view->enablevalidation)
client->query.fetchoptions |= DNS_FETCHOPT_NOVALIDATE;
/*
* Allow glue NS records to be added to the authority section
* if the answer is secure.
*/
if (message->flags & DNS_MESSAGEFLAG_CD)
client->query.attributes &= ~NS_QUERYATTR_SECURE;
/*
* Set 'want_ad' if the client has set AD in the query.
* This allows AD to be returned on queries without DO set.
*/
if ((message->flags & DNS_MESSAGEFLAG_AD) != 0)
want_ad = ISC_TRUE;
else
want_ad = ISC_FALSE;
/*
* This is an ordinary query.
*/
result = dns_message_reply(message, ISC_TRUE);
if (result != ISC_R_SUCCESS) {
query_next(client, result);
return;
}
/*
* Assume authoritative response until it is known to be
* otherwise.
*
* If "-T noaa" has been set on the command line don't set
* AA on authoritative answers.
*/
if (!ns_g_noaa)
message->flags |= DNS_MESSAGEFLAG_AA;
/*
* Set AD. We must clear it if we add non-validated data to a
* response.
*/
if (WANTDNSSEC(client) || want_ad)
message->flags |= DNS_MESSAGEFLAG_AD;
qclient = NULL;
ns_client_attach(client, &qclient);
(void)query_find(qclient, NULL, qtype);
}