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Make rbtdb maintain stale counters

Browse Source 
When updating the statistics for RRset types, if a header is marked
stale or ancient, the appropriate statistic counters are decremented,
then incremented.

Also fix some out of date comments.
This commit is contained in:
Matthijs Mekking
2019-08-07 13:27:59 +02:00
parent 48332d4478
commit a3af2c57e7
4 changed files with 327 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
bin/tests/system/serve-stale/clean.sh
View File

@@ -15,3 +15,4 @@ rm -f rndc.out.test*
rm -f */named.run */named.memstats
rm -f ns*/managed-keys.bind*
rm -f ns*/named_dump*
rm -f ns*/named.stats*

2
bin/tests/system/serve-stale/ns1/named2.conf.in
View File

@@ -27,7 +27,7 @@ options {
listen-on { 10.53.0.1; };
listen-on-v6 { none; };
recursion yes;
max-stale-ttl 7200;
max-stale-ttl 35;
stale-answer-ttl 3;
stale-answer-enable yes;
};

270
bin/tests/system/serve-stale/tests.sh
View File

@@ -31,6 +31,11 @@ n=0
#$DIG -p ${PORT} @10.53.0.2 nodata.example TXT
#$DIG -p ${PORT} @10.53.0.2 nxdomain.example TXT
#
# First test server with serve-stale options set.
#
echo_i "test server with serve-stale options set"
n=`expr $n + 1`
echo_i "prime cache longttl.example ($n)"
ret=0
@@ -67,6 +72,22 @@ grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "verify prime cache statistics ($n)"
ret=0
rm -f ns1/named.stats
$RNDCCMD 10.53.0.1 stats > /dev/null 2>&1
[ -f ns1/named.stats ] || ret=1
cp ns1/named.stats ns1/named.stats.$n
# Check first 10 lines of Cache DB statistics. After prime queries, we expect
# two active TXT one nxrrset TXT, and one NXDOMAIN.
grep -A 10 "++ Cache DB RRsets ++" ns1/named.stats.$n > ns1/named.stats.$n.cachedb || ret=1
grep "2 TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 !TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 NXDOMAIN" ns1/named.stats.$n.cachedb > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "disable responses from authoritative server ($n)"
ret=0
@@ -125,6 +146,24 @@ grep "example\..*2.*IN.*SOA" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "verify stale cache statistics ($n)"
ret=0
rm -f ns1/named.stats
$RNDCCMD 10.53.0.1 stats > /dev/null 2>&1
[ -f ns1/named.stats ] || ret=1
cp ns1/named.stats ns1/named.stats.$n
# Check first 10 lines of Cache DB statistics. After serve-stale queries, we
# expect one active TXT RRset, one stale TXT, one stale nxrrset TXT, and one
# stale NXDOMAIN.
grep -A 10 "++ Cache DB RRsets ++" ns1/named.stats.$n > ns1/named.stats.$n.cachedb || ret=1
grep "1 TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 #TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 #!TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 #NXDOMAIN" ns1/named.stats.$n.cachedb > /dev/null || ret=1
status=`expr $status + $ret`
if [ $ret != 0 ]; then echo_i "failed"; fi
n=`expr $n + 1`
echo_i "running 'rndc serve-stale off' ($n)"
ret=0
@@ -362,6 +401,12 @@ grep '_default: off (rndc) (stale-answer-ttl=2 max-stale-ttl=3600)' rndc.out.tes
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
#
# Update named.conf.
# Test server with low max-stale-ttl.
#
echo_i "test server with serve-stale options set, low max-stale-ttl"
n=`expr $n + 1`
echo_i "updating ns1/named.conf ($n)"
ret=0
@@ -380,23 +425,7 @@ n=`expr $n + 1`
echo_i "check 'rndc serve-stale status' ($n)"
ret=0
$RNDCCMD 10.53.0.1 serve-stale status > rndc.out.test$n 2>&1 || ret=1
grep '_default: off (rndc) (stale-answer-ttl=3 max-stale-ttl=7200)' rndc.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "check 'rndc serve-stale' ($n)"
ret=0
$RNDCCMD 10.53.0.1 serve-stale > rndc.out.test$n 2>&1 && ret=1
grep "unexpected end of input" rndc.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "check 'rndc serve-stale unknown' ($n)"
ret=0
$RNDCCMD 10.53.0.1 serve-stale unknown > rndc.out.test$n 2>&1 && ret=1
grep "syntax error" rndc.out.test$n > /dev/null || ret=1
grep '_default: off (rndc) (stale-answer-ttl=3 max-stale-ttl=35)' rndc.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
@@ -411,6 +440,14 @@ grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "check 'rndc serve-stale status' ($n)"
ret=0
$RNDCCMD 10.53.0.1 serve-stale status > rndc.out.test$n 2>&1 || ret=1
grep '_default: on (rndc) (stale-answer-ttl=3 max-stale-ttl=35)' rndc.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "enable responses from authoritative server ($n)"
ret=0
@@ -420,6 +457,171 @@ grep "TXT.\"1\"" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
sleep 1
n=`expr $n + 1`
echo_i "prime cache longttl.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 longttl.example TXT > dig.out.test$n
grep "status: NOERROR" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 1," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "prime cache data.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 data.example TXT > dig.out.test$n
grep "status: NOERROR" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 1," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "prime cache nodata.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 nodata.example TXT > dig.out.test$n
grep "status: NOERROR" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "prime cache nxdomain.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 nxdomain.example TXT > dig.out.test$n
grep "status: NXDOMAIN" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "verify prime cache statistics (low max-stale-ttl) ($n)"
ret=0
rm -f ns1/named.stats
$RNDCCMD 10.53.0.1 stats > /dev/null 2>&1
[ -f ns1/named.stats ] || ret=1
cp ns1/named.stats ns1/named.stats.$n
# Check first 10 lines of Cache DB statistics. After prime queries, we expect
# two active TXT RRsets, one nxrrset TXT, and one NXDOMAIN.
grep -A 10 "++ Cache DB RRsets ++" ns1/named.stats.$n > ns1/named.stats.$n.cachedb || ret=1
grep "2 TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 !TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 NXDOMAIN" ns1/named.stats.$n.cachedb > /dev/null || ret=1
status=`expr $status + $ret`
if [ $ret != 0 ]; then echo_i "failed"; fi
n=`expr $n + 1`
echo_i "disable responses from authoritative server ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.2 txt disable > dig.out.test$n
grep "ANSWER: 1," dig.out.test$n > /dev/null || ret=1
grep "TXT.\"0\"" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
sleep 1
n=`expr $n + 1`
echo_i "check stale data.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 data.example TXT > dig.out.test$n
grep "status: NOERROR" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 1," dig.out.test$n > /dev/null || ret=1
grep "data\.example\..*3.*IN.*TXT.*A text record with a 1 second ttl" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "check stale nodata.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 nodata.example TXT > dig.out.test$n
grep "status: NOERROR" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
grep "example\..*3.*IN.*SOA" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "check stale nxdomain.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 nxdomain.example TXT > dig.out.test$n
grep "status: NXDOMAIN" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
grep "example\..*3.*IN.*SOA" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "verify stale cache statistics (low max-stale-ttl) ($n)"
ret=0
rm -f ns1/named.stats
$RNDCCMD 10.53.0.1 stats > /dev/null 2>&1
[ -f ns1/named.stats ] || ret=1
cp ns1/named.stats ns1/named.stats.$n
# Check first 10 lines of Cache DB statistics. After serve-stale queries, we
# expect one active TXT RRset, one stale TXT, one stale nxrrset TXT, and one
# stale NXDOMAIN.
grep -A 10 "++ Cache DB RRsets ++" ns1/named.stats.$n > ns1/named.stats.$n.cachedb || ret=1
grep "1 TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 #TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 #!TXT" ns1/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 #NXDOMAIN" ns1/named.stats.$n.cachedb > /dev/null || ret=1
status=`expr $status + $ret`
if [ $ret != 0 ]; then echo_i "failed"; fi
sleep 1
n=`expr $n + 1`
echo_i "check ancient data.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 data.example TXT > dig.out.test$n
grep "status: SERVFAIL" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "check ancient nodata.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 nodata.example TXT > dig.out.test$n
grep "status: SERVFAIL" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "check ancient nxdomain.example (low max-stale-ttl) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.1 nxdomain.example TXT > dig.out.test$n
grep "status: SERVFAIL" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
#
# Now test server with no serve-stale options set.
#
echo_i "test server with no serve-stale options set"
n=`expr $n + 1`
echo_i "enable responses from authoritative server ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.2 txt enable > dig.out.test$n
grep "ANSWER: 1," dig.out.test$n > /dev/null || ret=1
grep "TXT.\"1\"" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "prime cache longttl.example (max-stale-ttl default) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.3 longttl.example TXT > dig.out.test$n
grep "status: NOERROR" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 1," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "prime cache data.example (max-stale-ttl default) ($n)"
ret=0
@@ -459,6 +661,22 @@ grep "TXT.\"0\"" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "verify prime cache statistics (max-stale-ttl default) ($n)"
ret=0
rm -f ns3/named.stats
$RNDCCMD 10.53.0.3 stats > /dev/null 2>&1
[ -f ns3/named.stats ] || ret=1
cp ns3/named.stats ns3/named.stats.$n
# Check first 10 lines of Cache DB statistics. After prime queries, we expect
# two active TXT RRsets, one nxrrset TXT, and one NXDOMAIN.
grep -A 10 "++ Cache DB RRsets ++" ns3/named.stats.$n > ns3/named.stats.$n.cachedb || ret=1
grep "2 TXT" ns3/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 !TXT" ns3/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 NXDOMAIN" ns3/named.stats.$n.cachedb > /dev/null || ret=1
status=`expr $status + $ret`
if [ $ret != 0 ]; then echo_i "failed"; fi
sleep 1
n=`expr $n + 1`
@@ -496,6 +714,24 @@ grep "ANSWER: 0," dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
n=`expr $n + 1`
echo_i "verify stale cache statistics (max-stale-ttl default) ($n)"
ret=0
rm -f ns3/named.stats
$RNDCCMD 10.53.0.3 stats > /dev/null 2>&1
[ -f ns3/named.stats ] || ret=1
cp ns3/named.stats ns3/named.stats.$n
# Check first 10 lines of Cache DB statistics. After last queries, we expect
# one active TXT RRset, one stale TXT, one stale nxrrset TXT, and one
# stale NXDOMAIN.
grep -A 10 "++ Cache DB RRsets ++" ns3/named.stats.$n > ns3/named.stats.$n.cachedb || ret=1
grep "1 TXT" ns3/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 #TXT" ns3/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 #!TXT" ns3/named.stats.$n.cachedb > /dev/null || ret=1
grep "1 #NXDOMAIN" ns3/named.stats.$n.cachedb > /dev/null || ret=1
status=`expr $status + $ret`
if [ $ret != 0 ]; then echo_i "failed"; fi
n=`expr $n + 1`
echo_i "check 'rndc serve-stale on' ($n)"
ret=0

93
lib/dns/rbtdb.c
View File

@@ -194,7 +194,7 @@ typedef struct rdatasetheader {
rbtdb_serial_t serial;
dns_ttl_t rdh_ttl;
rbtdb_rdatatype_t type;
uint16_t attributes;
uint16_t attributes;
dns_trust_t trust;
struct noqname *noqname;
struct noqname *closest;
@@ -831,17 +831,23 @@ update_rrsetstats(dns_rbtdb_t *rbtdb, rdatasetheader_t *header,
statattributes = DNS_RDATASTATSTYPE_ATTR_NXRRSET;
base = RBTDB_RDATATYPE_EXT(header->type);
}
} else
} else {
base = RBTDB_RDATATYPE_BASE(header->type);
}
if (STALE(header))
if (STALE(header)) {
statattributes |= DNS_RDATASTATSTYPE_ATTR_STALE;
}
if (ANCIENT(header)) {
statattributes |= DNS_RDATASTATSTYPE_ATTR_ANCIENT;
}
type = DNS_RDATASTATSTYPE_VALUE(base, statattributes);
if (increment)
if (increment) {
dns_rdatasetstats_increment(rbtdb->rrsetstats, type);
else
} else {
dns_rdatasetstats_decrement(rbtdb->rrsetstats, type);
}
}
static void
@@ -1507,24 +1513,68 @@ rollback_node(dns_rbtnode_t *node, rbtdb_serial_t serial) {
static inline void
mark_header_ancient(dns_rbtdb_t *rbtdb, rdatasetheader_t *header) {
bool do_stats = false;
/*
* If we are already ancient there is nothing to do.
*/
if (ANCIENT(header))
if (ANCIENT(header)) {
return;
}
if ((header->attributes & RDATASET_ATTR_STATCOUNT) != 0) {
do_stats = EXISTS(header);
}
if (do_stats) {
/*
* Decrement the stats counter for the appropriate RRtype.
* If the STALE attribute is set, this will decrement the
* stale type counter, otherwise it decrements the active
* stats type counter.
*/
update_rrsetstats(rbtdb, header, false);
}
header->attributes |= RDATASET_ATTR_ANCIENT;
header->node->dirty = 1;
/*
* If we have not been counted then there is nothing to do.
*/
if ((header->attributes & RDATASET_ATTR_STATCOUNT) == 0)
return;
if (EXISTS(header))
if (do_stats) {
/* Increment the stats counter for the ancient RRtype. */
update_rrsetstats(rbtdb, header, true);
}
}
static inline void
mark_header_stale(dns_rbtdb_t *rbtdb, rdatasetheader_t *header) {
bool do_stats = false;
/*
* If we are already stale there is nothing to do.
*/
if (STALE(header)) {
return;
}
if ((header->attributes & RDATASET_ATTR_STATCOUNT) != 0) {
do_stats = EXISTS(header);
}
if (do_stats) {
/* Decrement the stats counter for the appropriate RRtype.
* If the ANCIENT attribute is set (although it is very
* unlikely that an RRset goes from ANCIENT to STALE), this
* will decrement the ancient stale type counter, otherwise it
* decrements the active stats type counter.
*/
update_rrsetstats(rbtdb, header, false);
}
header->attributes |= RDATASET_ATTR_STALE;
if (do_stats) {
update_rrsetstats(rbtdb, header, true);
}
}
static inline void
@@ -4320,7 +4370,7 @@ check_stale_header(dns_rbtnode_t *node, rdatasetheader_t *header,
* skip this record.
*/
if (KEEPSTALE(search->rbtdb) && stale > search->now) {
header->attributes |= RDATASET_ATTR_STALE;
mark_header_stale(search->rbtdb, header);
*header_prev = header;
return ((search->options & DNS_DBFIND_STALEOK) == 0);
}
@@ -4328,7 +4378,7 @@ check_stale_header(dns_rbtnode_t *node, rdatasetheader_t *header,
/*
* This rdataset is stale. If no one else is using the
* node, we can clean it up right now, otherwise we mark
* it as stale, and the node as dirty, so it will get
* it as ancient, and the node as dirty, so it will get
* cleaned up later.
*/
if ((header->rdh_ttl < search->now - RBTDB_VIRTUAL) &&
@@ -5289,7 +5339,8 @@ expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now) {
mark_header_ancient(rbtdb, header);
if (log)
isc_log_write(dns_lctx, category, module,
level, "overmem cache: stale %s",
level,
"overmem cache: ancient %s",
printname);
} else if (force_expire) {
if (! RETAIN(header)) {
@@ -5824,7 +5875,7 @@ add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
* which covers all types (NXDOMAIN,
* NODATA(QTYPE=ANY)),
*
* We make all other data stale so that the
* We make all other data ancient so that the
* only rdataset that can be found at this
* node is the negative cache entry.
*/
@@ -5839,7 +5890,7 @@ add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
}
/*
* Otherwise look for any RRSIGs of the given
* type so they can be marked stale later.
* type so they can be marked ancient later.
*/
for (topheader = rbtnode->data;
topheader != NULL;
@@ -5851,9 +5902,9 @@ add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
/*
* We're adding something that isn't a
* negative cache entry. Look for an extant
* non-stale NXDOMAIN/NODATA(QTYPE=ANY) negative
* non-ancient NXDOMAIN/NODATA(QTYPE=ANY) negative
* cache entry. If we're adding an RRSIG, also
* check for an extant non-stale NODATA ncache
* check for an extant non-ancient NODATA ncache
* entry which covers the same type as the RRSIG.
*/
for (topheader = rbtnode->data;
@@ -6533,7 +6584,7 @@ addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
* If we're adding a delegation type, adding to the auxiliary NSEC tree,
* or the DB is a cache in an overmem state, hold an exclusive lock on
* the tree. In the latter case the lock does not necessarily have to
* be acquired but it will help purge stale entries more effectively.
* be acquired but it will help purge ancient entries more effectively.
*/
if (IS_CACHE(rbtdb) && isc_mem_isovermem(rbtdb->common.mctx))
cache_is_overmem = true;