upstream/bind9
1
0
Fork 0
mirror of https://github.com/isc-projects/bind9.git synced 2026-04-26 08:39:00 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Add serve-stale CNAME check with stale-answer-client-timeout off

Browse source 
Prime the cache with the following records:

    shortttl.cname.example.	1	IN	CNAME	longttl.target.example.
    longttl.target.example.	600	IN	A	10.53.0.2

Wait for the CNAME record to expire, disable the authoritative server,
and query 'shortttl.cname.example' again, expecting a stale answer.
This commit is contained in:
Aram Sargsyan 2022-11-17 13:48:36 +00:00
parent 84a7be327e
commit 21faf44ef7
2 changed files with 98 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
bin/tests/system/serve-stale/ans2/ans.pl
View file

@ -58,6 +58,8 @@ my $CAA = "othertype.example 2 IN CAA 0 issue \"ca1.example.net\"";
my $negSOA = "example 2 IN SOA . . 0 0 0 0 300";
my $CNAME = "cname.example 7 IN CNAME target.example";
my $TARGET = "target.example 9 IN A $localaddr";
my $SHORTCNAME = "shortttl.cname.example 1 IN CNAME longttl.target.example";
my $LONGTARGET = "longttl.target.example 600 IN A $localaddr";
sub reply_handler {
my ($qname, $qclass, $qtype) = @_;
@ -166,6 +168,28 @@ sub reply_handler {
push @auth, $rr;
}
$rcode = "NOERROR";
} elsif ($qname eq "shortttl.cname.example") {
if ($qtype eq "A") {
my $rr = new Net::DNS::RR($SHORTCNAME);
push @ans, $rr;
} else {
my $rr = new Net::DNS::RR($negSOA);
push @auth, $rr;
}
$rcode = "NOERROR";
} elsif ($qname eq "longttl.target.example") {
if ($slow_response) {
print " Sleeping 3 seconds\n";
sleep(3);
}
if ($qtype eq "A") {
my $rr = new Net::DNS::RR($LONGTARGET);
push @ans, $rr;
} else {
my $rr = new Net::DNS::RR($negSOA);
push @auth, $rr;
}
$rcode = "NOERROR";
} elsif ($qname eq "longttl.example") {
if ($qtype eq "TXT") {
my $rr = new Net::DNS::RR($LONGTXT);

74
bin/tests/system/serve-stale/tests.sh
View file

@ -1829,6 +1829,80 @@ grep "data\.example\..*[12].*IN.*TXT.*A text record with a 2 second ttl" dig.out
if [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status+ret))
##############################################################
# Test for stale-answer-client-timeout off and CNAME record. #
##############################################################
echo_i "test stale-answer-client-timeout (0) and CNAME record"
n=$((n+1))
echo_i "prime cache shortttl.cname.example (stale-answer-client-timeout off) ($n)"
ret=0
$DIG -p ${PORT} @10.53.0.3 shortttl.cname.example A > dig.out.test$n
grep "status: NOERROR" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 2," dig.out.test$n > /dev/null || ret=1
grep "shortttl\.cname\.example\..*1.*IN.*CNAME.*longttl\.target\.example\." dig.out.test$n > /dev/null || ret=1
grep "longttl\.target\.example\..*600.*IN.*A.*10\.53\.0\.2" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status+ret))
# Allow RRset to become stale.
sleep 1
n=$((n+1))
echo_i "disable responses from authoritative server ($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 [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
ret=0
echo_i "check stale shortttl.cname.example comes from cache (stale-answer-client-timeout off) ($n)"
nextpart ns3/named.run > /dev/null
$DIG -p ${PORT} @10.53.0.3 shortttl.cname.example A > dig.out.test$n
wait_for_log 5 "shortttl.cname.example A resolver failure, stale answer used" ns3/named.run || ret=1
grep "status: NOERROR" dig.out.test$n > /dev/null || ret=1
grep "EDE: 3 (Stale Answer): (resolver failure)" dig.out.test$n > /dev/null || ret=1
grep "ANSWER: 2," dig.out.test$n > /dev/null || ret=1
grep "shortttl\.cname\.example\..*3.*IN.*CNAME.*longttl\.target\.example\." dig.out.test$n > /dev/null || ret=1
# We can't reliably test the TTL of the longttl.target.example A record.
grep "longttl\.target\.example\..*IN.*A.*10\.53\.0\.2" dig.out.test$n > /dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "enable responses from authoritative server ($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 [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status+ret))
n=$((n+1))
echo_i "check server is alive or restart ($n)"
ret=0
$RNDCCMD 10.53.0.3 status > rndc.out.test$n 2>&1 || ret=1
if [ $ret != 0 ]; then
echo_i "failed"
echo_i "restart ns3"
start_server --noclean --restart --port ${PORT} serve-stale ns3
fi
status=$((status+ret))
n=$((n+1))
echo_i "check server is alive or restart ($n)"
ret=0
$RNDCCMD 10.53.0.3 status > rndc.out.test$n 2>&1 || ret=1
if [ $ret != 0 ]; then
echo_i "failed"
echo_i "restart ns3"
start_server --noclean --restart --port ${PORT} serve-stale ns3
fi
status=$((status+ret))
#############################################
# Test for stale-answer-client-timeout 0. #
#############################################