#!/usr/bin/perl -w
# $Id: time-query,v 1.1 2000/11/10 16:05:48 mfuhr Exp mfuhr $

use Net::DNS;
use IO::Socket;
use IO::Select;
use Time::HiRes qw(gettimeofday);
use Getopt::Std;
use strict;

use constant DEFAULT_TIMEOUT => 30;

my %opt;
getopts("t:", \%opt);
die "Usage: $0 [ -t timeout ] nameserver query-name\n" unless @ARGV == 2;
my ($nameserver, $query) = @ARGV;
my $timeout = $opt{"t"} || DEFAULT_TIMEOUT;

my $packet = Net::DNS::Packet->new($query)->data;

my $sock = IO::Socket::INET->new(
    "PeerAddr" => $nameserver,
    "PeerPort" => "53",
    "Proto"    => "udp",
);

my $sel = IO::Select->new($sock);

my $start = gettimeofday;
$sock->send($packet);
my @ready = $sel->can_read($timeout);
my $end = gettimeofday;

if (@ready) {
    printf "%.3f  %s\n", ($end - $start), $nameserver;
}
else {
    print "timeout  $nameserver\n";
}