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[9.20] new: test: Test another 'stale-answer-client-timeout 0' scenario

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Add a test to check serve-stale with the 'stale-answer-client-timeout 0'
configuration option and with a delegation which is a CNAME to a auth
zone.

Closes #5372

Backport of MR !10920

Merge branch 'backport-5372-serve-stale-crash-on-insist-unreachable-test-9.20' into 'bind-9.20'

See merge request isc-projects/bind9!10927
This commit is contained in:
Andoni Duarte 2025-09-02 10:32:11 +00:00
commit 8540cde99c
3 changed files with 39 additions and 3 deletions
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9
bin/tests/system/serve-stale/ans2/ans.pl
View file

@ -259,6 +259,15 @@ sub reply_handler {
push @auth, $rr;
}
$rcode = "NOERROR";
} elsif ($qname eq "cname.delegated.serve.stale") {
if ($qtype eq "A") {
my $rr = new Net::DNS::RR("cname.delegated.serve.stale 2 IN CNAME cname-target.serve.stale.");
push @ans, $rr;
} else {
my $rr = new Net::DNS::RR($ssnegSOA);
push @auth, $rr;
}
$rcode = "NOERROR";
} elsif ($qname eq "ns.slow" ) {
if ($qtype eq "A") {
my $rr = new Net::DNS::RR($slowA);

1
bin/tests/system/serve-stale/ns3/serve.stale.db
View file

@ -18,4 +18,5 @@ test IN NS nss1.example.nxd.
test IN NS nss2.example.nxd.
delegated IN NS ns2.delegated.serve.stale.
cname-target IN A 10.53.0.99
ns2.delegated IN A 10.53.0.2

32
bin/tests/system/serve-stale/tests.sh
View file

@ -2573,12 +2573,13 @@ grep "2001:aaaa" dig.out.2.test$n >/dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status + ret))
n=$((n + 1))
echo_i "check serve-stale (stale-answer-client-timeout 0) with a delegation ($n)"
ret=0
# configure ns3 with stale-answer-client-timeout 0 and a delegated zone
copy_setports ns3/named9.conf.in ns3/named.conf
rndc_reload ns3 10.53.0.3
n=$((n + 1))
echo_i "check serve-stale (stale-answer-client-timeout 0) with a delegation ($n)"
ret=0
# flush cache, enable ans2 responses, make sure serve-stale is on
$RNDCCMD 10.53.0.3 flush >rndc.out.test$n.1 2>&1 || ret=1
$DIG -p ${PORT} @10.53.0.2 txt enable >/dev/null || ret=1
@ -2601,5 +2602,30 @@ $DIG -p ${PORT} @10.53.0.2 txt enable >/dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status + ret))
n=$((n + 1))
echo_i "check serve-stale (stale-answer-client-timeout 0) with a delegation which is a CNAME to a local zone ($n)"
ret=0
# flush cache, enable ans2 responses, make sure serve-stale is on
$RNDCCMD 10.53.0.3 flush >rndc.out.test$n.1 2>&1 || ret=1
$DIG -p ${PORT} @10.53.0.2 txt enable >/dev/null || ret=1
$RNDCCMD 10.53.0.3 serve-stale on >rndc.out.test$n.2 2>&1 || ret=1
# prime the cache with the A response
$DIG -p ${PORT} @10.53.0.3 cname.delegated.serve.stale >dig.out.1.test$n || ret=1
grep -F "status: NOERROR" dig.out.1.test$n >/dev/null || ret=1
grep -F "10.53.0.99" dig.out.1.test$n >/dev/null || ret=1
# disable responses from the auth server
$DIG -p ${PORT} @10.53.0.2 txt disable >/dev/null || ret=1
# wait two seconds for the previous answer to become stale
sleep 2
# resend the query; we should immediately get a stale answer
$DIG -p ${PORT} @10.53.0.3 cname.delegated.serve.stale >dig.out.2.test$n || ret=1
grep -F "status: NOERROR" dig.out.2.test$n >/dev/null || ret=1
grep -F "EDE: 3 (Stale Answer): (stale data prioritized over lookup)" dig.out.2.test$n >/dev/null || ret=1
grep -F "10.53.0.99" dig.out.2.test$n >/dev/null || ret=1
# re-enable responses
$DIG -p ${PORT} @10.53.0.2 txt enable >/dev/null || ret=1
if [ $ret != 0 ]; then echo_i "failed"; fi
status=$((status + ret))
echo_i "exit status: $status"
[ $status -eq 0 ] || exit 1