#!/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
] [-p ] [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] [-b source_port] [file]\n"); exit 1; } my %options={}; getopts("s:p:b:", \%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 $source_port = 0; $source_port = $options{b} if defined $options{b}; 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", LocalPort => $source_port, ) or die "$!"; my $bytes = $sock->send($packet->data); #print ("sent $bytes bytes to $addr:$port:\n"); #print (" ", unpack("H* ", $packet->data), "\n"); $sock->close; } close $file;