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#!/usr/bin/perl
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
# This is a tool for sending queries via UDP to specified address and
# port, then exiting without waiting for a response.
#
# Usage: ditch.pl [-s <address>] [-p <port>] [filename]
#
# Input (in filename, if specified, otherwise stdin) is a series of one
# or more DNS names and types to send as queries, e.g.:
#
# www.example.com A
# www.example.org MX
#
# If not specified, address defaults to 127.0.0.1, port to 53.
require 5.006.001;
use strict;
use Getopt::Std;
use Net::DNS;
use Net::DNS::Packet;
use IO::File;
use IO::Socket;
sub usage {
print ("Usage: ditch.pl [-s address] [-p port] [file]\n");
exit 1;
}
my %options={};
getopts("s:p:t:", \%options);
my $addr = "127.0.0.1";
$addr = $options{s} if defined $options{s};
my $port = 53;
$port = $options{p} if defined $options{p};
my $file = "STDIN";
if (@ARGV >= 1) {
my $filename = shift @ARGV;
open FH, "<$filename" or die "$filename: $!";
$file = "FH";
}
my $input = "";
while (defined(my $line = <$file>) ) {
chomp $line;
next if ($line =~ m/^ *#/);
my @tokens = split (' ', $line);
my $packet;
if ($Net::DNS::VERSION > 0.68) {
$packet = new Net::DNS::Packet();
$@ and die $@;
} else {
my $err;
($packet, $err) = new Net::DNS::Packet();
$err and die $err;
}
my $q = new Net::DNS::Question($tokens[0], $tokens[1], "IN");
$packet->header->rd(1);
$packet->push(question => $q);
my $sock = IO::Socket::INET->new(PeerAddr => $addr, PeerPort => $port,
Proto => "udp",) or die "$!";
my $bytes = $sock->send($packet->data);
#print ("sent $bytes bytes to $addr:$port:\n");
#print (" ", unpack("H* ", $packet->data), "\n");
$sock->close;
}
close $file;
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