Adding upstream version 2.4.2+debian.

Signed-off-by: Daniel Baumann <daniel@debian.org>

README.md

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+# dnsperf
+
+[![Build Status](https://travis-ci.com/DNS-OARC/dnsperf.svg?branch=develop)](https://travis-ci.com/DNS-OARC/dnsperf) [![Total alerts](https://img.shields.io/lgtm/alerts/g/DNS-OARC/dnsperf.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/DNS-OARC/dnsperf/alerts/) [![Bugs](https://sonarcloud.io/api/project_badges/measure?project=dns-oarc%3Adnsperf&metric=bugs)](https://sonarcloud.io/dashboard?id=dns-oarc%3Adnsperf) [![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=dns-oarc%3Adnsperf&metric=security_rating)](https://sonarcloud.io/dashboard?id=dns-oarc%3Adnsperf)
+
+`dnsperf` and `resperf` are free tools developed by Nominum/Akamai (2006-2018)
+and DNS-OARC (since 2019) that make it simple to gather accurate latency and
+throughput metrics for Domain Name Service (DNS). These tools are easy-to-use
+and simulate typical Internet, so network operators can benchmark their naming
+and addressing infrastructure and plan for upgrades. The latest version of
+the `dnsperf` and `resperf` can be used with test files that include IPv6
+queries.
+
+`dnsperf` "self-paces" the DNS query load to simulate network conditions.
+New features in `dnsperf` improve the precision of latency measurements and
+allow for per packet per-query latency reporting is possible. `dnsperf` is
+now multithreaded, multiple `dnsperf` clients can be supported in multicore
+systems (each client requires two cores). The output of `dnsperf` has also
+been improved so it is more concise and useful. Latency data can be used to
+make detailed graphs, so it is simple for network operators to take advantage
+of the data.
+
+`resperf` systematically increases the query rate and monitors the response
+rate to simulate caching DNS services.
+
+See also the `dnsperf(1)` and `resperf(1)` man pages.
+
+More information may be found here:
+- https://www.dns-oarc.net/tools/dnsperf
+
+Issues should be reported here:
+- https://github.com/DNS-OARC/dnsperf/issues
+
+General support and discussion:
+- Mattermost: https://chat.dns-oarc.net/community/channels/oarc-software
+
+## Usage
+
+`dnsperf` and `resperf` read input files describing DNS queries, and send
+those queries to DNS servers to measure performance.
+
+## Dependencies
+
+`dnsperf` requires a couple of libraries beside a normal C compiling
+environment with autoconf, automake, libtool and pkgconfig.
+
+- [OpenSSL](https://www.openssl.org/) - for TSIG support
+- [LDNS](https://nlnetlabs.nl/projects/ldns/about/) - optional for dynamic update support
+
+To install the dependencies under Debian/Ubuntu:
+```
+apt-get install -y libssl-dev libldns-dev
+```
+
+To install the dependencies under CentOS (with EPEL enabled):
+```
+yum install -y openssl-devel ldns-devel
+```
+
+To install the dependencies under FreeBSD 12+ using `pkg`:
+```
+pkg install -y openssl ldns
+```
+
+To install the dependencies under OpenBSD 6+ using `pkg_add`:
+```
+pkg_add libldns
+```
+
+## Building from source tarball
+
+The [source tarball from DNS-OARC](https://www.dns-oarc.net/tools/dnsperf)
+comes prepared with `configure`:
+
+```
+tar zxvf dnsperf-version.tar.gz
+cd dnsperf-version
+./configure [options]
+make
+make install
+```
+
+## Building from Git repository
+
+```
+git clone https://github.com/DNS-OARC/dnsperf.git
+cd dnsperf
+./autogen.sh
+./configure [options]
+make
+make install
+```
+
+## Additional Software
+
+The contrib directory contains additional software related to `dnsperf` and
+`resperf`.
+
+## License
+
+```
+Copyright 2019-2021 OARC, Inc.
+Copyright 2017-2018 Akamai Technologies
+Copyright 2006-2016 Nominum, Inc.
+All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+```