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#!/usr/bin/perl -w
# verify that a DHCP server is operating.
#
# usage: dhcp.monitor [host ...]
#
# Uses Net::DHCP::Watch to send a DHCP inform message to each of the servers
# listed on the command line, and then waits up to 30 seconds for a response.
#
# The script will determine your mon server's mac address and IP by parsing the
# output of 'ifconfig eth0'. You may need to modify that logic for your
# operating system.
#
# Depending on your OS, you may need to have your mon server *not* be using DHCP
# for its own interface management, as some DHCP implementations will bind the
# DHCP port and refuse to allow Net::DHCP:Watch to generate and receive its own
# requests.
# Copyright (c) 2002 Carnegie Mellon University. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# 3. The name "Carnegie Mellon University" must not be used to endorse or
# promote products derived from this software without prior written
# permission. For permission or any legal details, please contact:
# Office of Technology Transfer
# Carnegie Mellon University
# 5000 Forbes Avenue
# Pittsburgh, PA 15213-3890
# (412) 268-4387, fax: (412) 268-7395
# tech-transfer@andrew.cmu.edu
#
# 4. Redistributions of any form whatsoever must retain the following
# acknowledgment: "This product includes software developed by Computing
# Services at Carnegie Mellon University (http://www.cmu.edu/computing/)."
#
# CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
# SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
# IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE FOR ANY SPECIAL,
# 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.
use Net::DHCP::Watch;
$Client = qx[ /sbin/ifconfig eth0 | /bin/sed 's/:/ /' | /bin/grep "inet addr" | /bin/awk '{print \$3}' ];
chomp($Client);
$Ether = qx[ /sbin/ifconfig eth0 | /bin/grep HWaddr | /bin/awk '{print \$5}'];
chomp($Ether);
foreach $host (@ARGV) {
eval {
my $dhcpw = new Net::DHCP::Watch({
client => $Client,
server => $host,
ether => $Ether,
timeout => 30,
});
my $success = 0;
foreach (1..3) {
$dhcpw->watch();
my $s = $dhcpw->status();
if ($s->{Ok}) {
$success = 1;
last;
}
$dhcpw->unwatch();
}
if (!$success) {
push @failures, $host;
push @longerr, "$host: DHCP INFORM request failed";
}
};
if ($EVAL_ERROR && ($EVAL_ERROR =~ /Timeout/ )) {
push @failures, $host;
push @longerr, "$host: Request timed out.";
} elsif ($EVAL_ERROR) {
push @longerr, "$host: $EVAL_ERROR";
push @failures, $host;
}
}
if (!@failures) {
exit 0;
}
print join(" ", @failures),"\n";
print join("\n", @longerr), "\n";
exit scalar @failures;
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