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[master] servfail cache

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3943.	[func]		SERVFAIL responses can now be cached for a
			limited time (configured by "servfail-ttl",
			default 10 seconds, limit 30). This can reduce
			the frequency of retries when an authoritative
			server is known to be failing, e.g., due to
			ongoing DNSSEC validation problems. [RT #21347]
This commit is contained in:
Evan Hunt
2014-09-03 23:28:14 -07:00
parent bb70b45c1f
commit a878301981
34 changed files with 1355 additions and 390 deletions
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100
bin/tests/system/sfcache/tests.sh Normal file
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#!/bin/sh
#
# Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
#
# 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.
SYSTEMTESTTOP=..
. $SYSTEMTESTTOP/conf.sh
status=0
n=0
rm -f dig.out.*
DIGOPTS="+tcp +noadd +nosea +nostat +nocmd -p 5300"
echo "I:checking DNSSEC SERVFAIL is cached ($n)"
ret=0
$DIG $DIGOPTS +dnssec foo.example. a @10.53.0.5 > dig.out.ns5.test$n || ret=1
$RNDC -c ../common/rndc.conf -s 10.53.0.5 -p 9953 dumpdb -all 2>&1 | sed 's/^/I:ns5 /'
for i in 1 2 3 4 5 6 7 8 9 10; do
awk '/Zone/{out=0} out; /SERVFAIL/{out=1}' ns5/named_dump.db > sfcache.$n
[ -s "sfcache.$n" ] && break
sleep 1
done
grep "^; foo.example/A" sfcache.$n > /dev/null || ret=1
n=`expr $n + 1`
if [ $ret != 0 ]; then echo "I:failed"; fi
status=`expr $status + $ret`
echo "I:checking SERVFAIL is returned from cache ($n)"
ret=0
$DIG $DIGOPTS +dnssec foo.example. a @10.53.0.5 > dig.out.ns5.test$n || ret=1
grep "SERVFAIL" dig.out.ns5.test$n > /dev/null || ret=1
n=`expr $n + 1`
if [ $ret != 0 ]; then echo "I:failed"; fi
status=`expr $status + $ret`
echo "I:checking that +cd bypasses cache check ($n)"
ret=0
$DIG $DIGOPTS +dnssec +cd foo.example. a @10.53.0.5 > dig.out.ns5.test$n || ret=1
grep "SERVFAIL" dig.out.ns5.test$n > /dev/null && ret=1
n=`expr $n + 1`
if [ $ret != 0 ]; then echo "I:failed"; fi
status=`expr $status + $ret`
echo "I:disabling server to force non-dnssec SERVFAIL"
$RNDC -c ../common/rndc.conf -s 10.53.0.2 -p 9953 stop 2>&1 | sed 's/^/I:ns2 /'
awk '/SERVFAIL/ { next; out=1 } /Zone/ { out=0 } out { print }' ns5/named_dump.db
echo "I:checking SERVFAIL is cached ($n)"
ret=0
$DIG $DIGOPTS bar.example. a @10.53.0.5 > dig.out.ns5.test$n || ret=1
$RNDC -c ../common/rndc.conf -s 10.53.0.5 -p 9953 dumpdb -all 2>&1 | sed 's/^/I:ns5 /'
for i in 1 2 3 4 5 6 7 8 9 10; do
awk '/Zone/{out=0} out; /SERVFAIL/{out=1}' ns5/named_dump.db > sfcache.$n
[ -s "sfcache.$n" ] && break
sleep 1
done
grep "^; bar.example/A" sfcache.$n > /dev/null || ret=1
n=`expr $n + 1`
if [ $ret != 0 ]; then echo "I:failed"; fi
status=`expr $status + $ret`
echo "I:checking SERVFAIL is returned from cache ($n)"
ret=0
$DIG $DIGOPTS bar.example. a @10.53.0.5 > dig.out.ns5.test$n || ret=1
grep "SERVFAIL" dig.out.ns5.test$n > /dev/null || ret=1
n=`expr $n + 1`
if [ $ret != 0 ]; then echo "I:failed"; fi
status=`expr $status + $ret`
echo "I:checking with +cd query ($n)"
ret=0
$DIG $DIGOPTS +cd bar.example. a @10.53.0.5 > dig.out.ns5.test$n || ret=1
grep "SERVFAIL" dig.out.ns5.test$n > /dev/null || ret=1
n=`expr $n + 1`
if [ $ret != 0 ]; then echo "I:failed"; fi
status=`expr $status + $ret`
echo "I:checking with +dnssec query ($n)"
ret=0
$DIG $DIGOPTS +cd bar.example. a @10.53.0.5 > dig.out.ns5.test$n || ret=1
grep "SERVFAIL" dig.out.ns5.test$n > /dev/null || ret=1
n=`expr $n + 1`
if [ $ret != 0 ]; then echo "I:failed"; fi
status=`expr $status + $ret`
echo "I:exit status: $status"
exit $status