49 lines
1 KiB
Perl
49 lines
1 KiB
Perl
#!/usr/bin/perl
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#
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# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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#
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# SPDX-License-Identifier: MPL-2.0
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, you can obtain one at https://mozilla.org/MPL/2.0/.
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#
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# See the COPYRIGHT file distributed with this work for additional
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# information regarding copyright ownership.
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# A simple nanny to make sure named stays running.
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$pid_file_location = '/var/run/named.pid';
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$nameserver_location = 'localhost';
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$dig_program = 'dig';
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$named_program = 'named';
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fork() && exit();
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for (;;) {
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$pid = 0;
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open(FILE, $pid_file_location) || goto restart;
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$pid = <FILE>;
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close(FILE);
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chomp($pid);
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$res = kill 0, $pid;
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goto restart if ($res == 0);
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$dig_command =
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"$dig_program +short . \@$nameserver_location > /dev/null";
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$return = system($dig_command);
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goto restart if ($return == 9);
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sleep 30;
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next;
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restart:
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if ($pid != 0) {
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kill 15, $pid;
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sleep 30;
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}
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system ($named_program);
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sleep 120;
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}
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