#!/usr/bin/perl # # Copyright (C) 2000, 2001 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 1.1.1.1 2003/01/10 00:48:02 bbraun 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; 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; }