use strict;
use warnings;

use IO::Socket::INET;

my $port   = getservbyname 'bootps', 'udp';
my $socket = IO::Socket::INET -> new (LocalPort  => $port,
                                      Broadcast  =>  1,
                                      Proto      => 'udp',
                                      ReuseAddr  => 1,
                                      Type       => SOCK_DGRAM)
             or die "Failed to bind to socket: $@";

my $mess;
$socket -> recv ($mess, 1024);
if (defined $mess) {
    print "Saw a bootp request.\n$mess\n";
} else {
    print "No bootp request.\n";
}