add duplicate signature test

bin/tests/system/dupsigs/tests.sh

@@ -0,0 +1,35 @@
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+SYSTEMTESTTOP=..
+. $SYSTEMTESTTOP/conf.sh
+
+status=0
+start=`date +%s`
+end=`expr $start + 1200`
+now=$start
+while test $now -lt $end
+do
+	et=`expr $now - $start`
+	echo "=============== $et ============"
+	$JOURNALPRINT ns1/signing.test.db.signed.jnl | $PERL check_journal.pl
+	$DIG axfr signing.test -p 5300 @10.53.0.1 > dig.out.at$et
+	awk '$4 == "RRSIG" { print $11 }' dig.out.at$et | sort | uniq -c
+	lines=`awk '$4 == "RRSIG" { print}' dig.out.at$et | wc -l`
+	if [ ${et} -ne 0 -a ${lines} -ne 4009 ]
+	then
+		echo_i "failed"
+		status=`expr $status + 1`
+	fi
+	sleep 20
+	now=`date +%s`
+done
+
+echo_i "exit status: $status"
+[ $status -eq 0 ] || exit 1