Commit 43383a70 authored by Michael Sawyer's avatar Michael Sawyer
Browse files

A small perl-based nanny program I used to keep bind running on my system.

It checks both that a process is running and uses dig to make sure it is
answering queries.  It's definately simple and probably a stop-gap solution.
parent c5de87b0
#!/usr/bin/perl
#
# 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.
#
# 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);
$ps_command = "ps -axw | grep named | grep $pid |";
# 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.
open(PIPE, $ps_command) || die($ps_command);
$line = <PIPE>;
close(PIPE);
chomp($line);
goto restart if ($line eq "");
$dig_command = "$dig_program +short . \@$nameserver_location > /dev/null";
$return = system($dig_command);
goto restart if ($return == 9);
sleep 90;
next;
restart:
if ($pid != 0) {
kill 15, $pid;
sleep 30;
}
system ($named_program);
sleep 120;
}
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