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-rw-r--r--contrib/scripts/nanny.pl49
1 files changed, 49 insertions, 0 deletions
diff --git a/contrib/scripts/nanny.pl b/contrib/scripts/nanny.pl
new file mode 100644
index 0000000..27a159e
--- /dev/null
+++ b/contrib/scripts/nanny.pl
@@ -0,0 +1,49 @@
+#!/usr/bin/perl
+
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# SPDX-License-Identifier: MPL-2.0
+#
+# 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 https://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+# A simple nanny to make sure named stays running.
+
+$pid_file_location = '/var/run/named.pid';
+$nameserver_location = 'localhost';
+$dig_program = 'dig';
+$named_program = 'named';
+
+fork() && exit();
+
+for (;;) {
+ $pid = 0;
+ open(FILE, $pid_file_location) || goto restart;
+ $pid = <FILE>;
+ close(FILE);
+ chomp($pid);
+
+ $res = kill 0, $pid;
+
+ goto restart if ($res == 0);
+
+ $dig_command =
+ "$dig_program +short . \@$nameserver_location > /dev/null";
+ $return = system($dig_command);
+ goto restart if ($return == 9);
+
+ sleep 30;
+ next;
+
+ restart:
+ if ($pid != 0) {
+ kill 15, $pid;
+ sleep 30;
+ }
+ system ($named_program);
+ sleep 120;
+}