# this is straight from the o'reilly book.
# the liberal use of globals is their idea, not mine :)
# It populates a global hash without returning it,
# and is probably only useful in the context of the book
# exercise -
sub lookupaddress{
    my($hostname,$server) = @_;

    $res = new Net::DNS::Resolver;

    $res->nameservers($server);

    $packet = $res->query($hostname);

    if (!$packet) {
	    warn "Unable to lookup data for $hostname from $server!\n";
	    return;
    }
    # stores the last RR we receive
    foreach $rr ($packet->answer) {
	    $results{$server}=$rr->address;
    }
}