You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
173 lines
6.1 KiB
173 lines
6.1 KiB
From b095854ee885dd5960cb54e7fbefb962498e9fdb Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@isc.org>
|
|
Date: Thu, 14 Nov 2024 10:37:29 +0100
|
|
Subject: [PATCH] Limit the additional processing for large RDATA sets
|
|
|
|
When answering queries, don't add data to the additional section if
|
|
the answer has more than 13 names in the RDATA. This limits the
|
|
number of lookups into the database(s) during a single client query,
|
|
reducing query processing load.
|
|
|
|
Also, don't append any additional data to type=ANY queries. The
|
|
answer to ANY is already big enough.
|
|
|
|
(cherry picked from commit a1982cf1bb95c818aa7b58988b5611dec80f2408)
|
|
PatchNumber: 47
|
|
---
|
|
bin/tests/system/additional/tests.sh | 2 +-
|
|
lib/dns/include/dns/rdataset.h | 12 ++++++++++++
|
|
lib/dns/rbtdb.c | 2 +-
|
|
lib/dns/rdataset.c | 11 +++++++++++
|
|
lib/ns/query.c | 15 ++++++++++-----
|
|
5 files changed, 35 insertions(+), 7 deletions(-)
|
|
|
|
diff --git a/bin/tests/system/additional/tests.sh b/bin/tests/system/additional/tests.sh
|
|
index 025f11f..846c800 100644
|
|
--- a/bin/tests/system/additional/tests.sh
|
|
+++ b/bin/tests/system/additional/tests.sh
|
|
@@ -260,7 +260,7 @@ n=`expr $n + 1`
|
|
echo_i "testing with 'minimal-any no;' ($n)"
|
|
ret=0
|
|
$DIG $DIGOPTS -t ANY www.rt.example @10.53.0.1 > dig.out.$n || ret=1
|
|
-grep "ANSWER: 3, AUTHORITY: 2, ADDITIONAL: 2" dig.out.$n > /dev/null || ret=1
|
|
+grep "ANSWER: 3, AUTHORITY: 2, ADDITIONAL: 1" dig.out.$n > /dev/null || ret=1
|
|
if [ $ret -eq 1 ] ; then
|
|
echo_i "failed"; status=$((status+1))
|
|
fi
|
|
diff --git a/lib/dns/include/dns/rdataset.h b/lib/dns/include/dns/rdataset.h
|
|
index f2585ef..54ad7b2 100644
|
|
--- a/lib/dns/include/dns/rdataset.h
|
|
+++ b/lib/dns/include/dns/rdataset.h
|
|
@@ -53,6 +53,8 @@
|
|
#include <dns/rdatastruct.h>
|
|
#include <dns/types.h>
|
|
|
|
+#define DNS_RDATASET_MAXADDITIONAL 13
|
|
+
|
|
ISC_LANG_BEGINDECLS
|
|
|
|
typedef enum {
|
|
@@ -458,13 +460,23 @@ dns_rdataset_additionaldata(dns_rdataset_t *rdataset,
|
|
*\li If a call to dns_rdata_additionaldata() is not successful, the
|
|
* result returned will be the result of dns_rdataset_additionaldata().
|
|
*
|
|
+ *\li If 'limit' is non-zero and the number of the rdatasets is larger
|
|
+ * than 'limit', no additional data will be processed.
|
|
+ *
|
|
* Returns:
|
|
*
|
|
*\li #ISC_R_SUCCESS
|
|
*
|
|
+ *\li #DNS_R_TOOMANYRECORDS in case rdataset count is larger than 'limit'
|
|
+ *
|
|
*\li Any error that dns_rdata_additionaldata() can return.
|
|
*/
|
|
|
|
+isc_result_t
|
|
+dns_rdataset_additionaldata2(dns_rdataset_t *rdataset,
|
|
+ dns_additionaldatafunc_t add, void *arg,
|
|
+ size_t limit);
|
|
+
|
|
isc_result_t
|
|
dns_rdataset_getnoqname(dns_rdataset_t *rdataset, dns_name_t *name,
|
|
dns_rdataset_t *neg, dns_rdataset_t *negsig);
|
|
diff --git a/lib/dns/rbtdb.c b/lib/dns/rbtdb.c
|
|
index ed5015c..7586e2a 100644
|
|
--- a/lib/dns/rbtdb.c
|
|
+++ b/lib/dns/rbtdb.c
|
|
@@ -10626,7 +10626,7 @@ no_glue:
|
|
maybe_rehash_gluetable(rbtversion);
|
|
idx = hash_32(hash, rbtversion->glue_table_bits);
|
|
|
|
- (void)dns_rdataset_additionaldata(rdataset, glue_nsdname_cb, &ctx);
|
|
+ (void)dns_rdataset_additionaldata2(rdataset, glue_nsdname_cb, &ctx, 0);
|
|
|
|
cur = isc_mem_get(rbtdb->common.mctx, sizeof(*cur));
|
|
|
|
diff --git a/lib/dns/rdataset.c b/lib/dns/rdataset.c
|
|
index bf9e7af..ffe6163 100644
|
|
--- a/lib/dns/rdataset.c
|
|
+++ b/lib/dns/rdataset.c
|
|
@@ -27,6 +27,7 @@
|
|
#include <dns/ncache.h>
|
|
#include <dns/rdata.h>
|
|
#include <dns/rdataset.h>
|
|
+#include <dns/result.h>
|
|
|
|
static const char *trustnames[] = {
|
|
"none", "pending-additional",
|
|
@@ -577,6 +578,12 @@ dns_rdataset_towire(dns_rdataset_t *rdataset, const dns_name_t *owner_name,
|
|
isc_result_t
|
|
dns_rdataset_additionaldata(dns_rdataset_t *rdataset,
|
|
dns_additionaldatafunc_t add, void *arg) {
|
|
+ return dns_rdataset_additionaldata2(rdataset, add, arg, 0);
|
|
+}
|
|
+
|
|
+isc_result_t
|
|
+dns_rdataset_additionaldata2(dns_rdataset_t *rdataset,
|
|
+ dns_additionaldatafunc_t add, void *arg, size_t limit) {
|
|
dns_rdata_t rdata = DNS_RDATA_INIT;
|
|
isc_result_t result;
|
|
|
|
@@ -588,6 +595,10 @@ dns_rdataset_additionaldata(dns_rdataset_t *rdataset,
|
|
REQUIRE(DNS_RDATASET_VALID(rdataset));
|
|
REQUIRE((rdataset->attributes & DNS_RDATASETATTR_QUESTION) == 0);
|
|
|
|
+ if (limit != 0 && dns_rdataset_count(rdataset) > limit) {
|
|
+ return DNS_R_TOOMANYRECORDS;
|
|
+ }
|
|
+
|
|
result = dns_rdataset_first(rdataset);
|
|
if (result != ISC_R_SUCCESS) {
|
|
return (result);
|
|
diff --git a/lib/ns/query.c b/lib/ns/query.c
|
|
index f7b3f78..5bc2908 100644
|
|
--- a/lib/ns/query.c
|
|
+++ b/lib/ns/query.c
|
|
@@ -2030,8 +2030,9 @@ addname:
|
|
* This cannot go more than MAX_RESTARTS levels deep.
|
|
*/
|
|
if (trdataset != NULL && dns_rdatatype_followadditional(type)) {
|
|
- eresult = dns_rdataset_additionaldata(
|
|
- trdataset, query_additional_cb, qctx);
|
|
+ eresult = dns_rdataset_additionaldata2(
|
|
+ trdataset, query_additional_cb, qctx,
|
|
+ DNS_RDATASET_MAXADDITIONAL);
|
|
}
|
|
|
|
cleanup:
|
|
@@ -2122,7 +2123,8 @@ regular:
|
|
* Add other additional data if needed.
|
|
* We don't care if dns_rdataset_additionaldata() fails.
|
|
*/
|
|
- (void)dns_rdataset_additionaldata(rdataset, query_additional_cb, qctx);
|
|
+ (void)dns_rdataset_additionaldata2(rdataset, query_additional_cb,
|
|
+ qctx, DNS_RDATASET_MAXADDITIONAL);
|
|
CTRACE(ISC_LOG_DEBUG(3), "query_additional: done");
|
|
}
|
|
|
|
@@ -2148,7 +2150,8 @@ query_addrrset(query_ctx_t *qctx, dns_name_t **namep,
|
|
* 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.
|
|
+ * already there. Also add any pertinent additional data, unless
|
|
+ * the query was for type ANY.
|
|
*
|
|
* If 'dbuf' is not NULL, then '*namep' is the name whose data is
|
|
* stored in 'dbuf'. In this case, query_addrrset() guarantees that
|
|
@@ -2203,7 +2206,9 @@ query_addrrset(query_ctx_t *qctx, dns_name_t **namep,
|
|
*/
|
|
query_addtoname(mname, rdataset);
|
|
query_setorder(qctx, mname, rdataset);
|
|
- query_additional(qctx, rdataset);
|
|
+ if (qctx->qtype != dns_rdatatype_any) {
|
|
+ query_additional(qctx, rdataset);
|
|
+ }
|
|
|
|
/*
|
|
* Note: we only add SIGs if we've added the type they cover, so
|
|
--
|
|
2.48.1
|
|
|