nanny.pl revision 40f53fa8d9c6a4fc38c0014495e7a42b08f52481
#
# Copyright (C) 2000 Internet Software Consortium.
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
# INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
# FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
# $Id: nanny.pl,v 1.6 2000/08/01 01:33:33 tale Exp $
# 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 (;;) {
$pid = 0;
close(FILE);
chomp($pid);
$ps_command = "ps -axw | grep named | grep $pid | grep -v grep |";
# ps_command MUST end in a pipe (|) character!
# Make sure there's a named on the pid we just got. Since there is no
# good way to test this, use the output from ps.
close(PIPE);
chomp($line);
$dig_command = "$dig_program +short . \@$nameserver_location > /dev/null";
$return = system($dig_command);
sleep 30;
next;
if ($pid != 0) {
kill 15, $pid;
sleep 30;
}
system ($named_program);
sleep 120;
}