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Zonemaster LDNS

Table of contents

Introduction

This module provides a Perl interface to the ldns library from NLnet Labs and depends on it being available. The module can either compile and use those libraries internally or link to already available ldns library given that the version is high enough. In both cases it relies on a sufficiently recent version of OpenSSL being present.

This module is written as part of the Zonemaster project, and therefore primarily exposes the functionality needed for that. Since Zonemaster is a diagnostic tool, that means the functions most used are those for looking things up and inspecting them.

If you want a module that specifically aims to be a complete and transparent interface to ldns, DNS::LDNS is a better fit than this module.

Initially this module was named Net::LDNS.

Dependencies and compatibility

Run-time dependencies:

  • openssl (openssl >= 1.1.1 unless Ed25519 is disabled)
  • libidn2 (if IDN is enabled)
  • libldns (if Internal ldns is disabled; libldns >= 1.7.0, or libldns >= 1.7.1 if Ed25519 is enabled)

Compile-time dependencies (only when installing from source):

Test-time dependencies:

  • Test::Fatal

There is a small part in the code that may not be compatible with non-Unix operating systems, in that it assumes that the file /dev/null exists.

Installation and verification

Recommended installation

The recommended way to install Zonemaster::LDNS is to follow the installation instructions for Zonemaster::Engine where you will find all prerequisites and dependencies for Zonemaster::LDNS before installing it.

Docker

Zonemaster-CLI is available on Docker Hub, and can be conveniently downloaded and run without any installation. See USING Zonemaster-CLI for how to run Zonemaster-CLI on Docker.

To build your own Docker image, see the Docker Image Creation documentation.

Installation from source

Override the default set of features by appending --FEATURE and/or --no-FEATURE options to the perl Makefile.PL command.

git clone https://github.com/zonemaster/zonemaster-ldns
cd zonemaster-ldns
perl Makefile.PL
make
make test
make install

Note: The source ZIP files downloaded from Github are broken with respect to this instruction.

Post-installation sanity check

perl -MZonemaster::LDNS -E 'say Zonemaster::LDNS->new("8.8.8.8")->query("zonemaster.net")->string'

The above command should print some dig-like output.

Testing

Some of the unit tests depend on data on the Internet, which may change. To avoid false fails, those unit tests are only run if the environment variable TEST_WITH_NETWORK is true. By default that variable is unset (those tests are not run). To run all tests, execute

TEST_WITH_NETWORK=1 make test

Optional features

When installing from source, you can choose to enable or disable a number of optional features using command line options to the perl Makefile.PL commands.

Ed25519

Enabled by default. Disabled with --no-ed25519

Requires support for algorithms Ed25519 and Ed448 in both openssl and ldns.

Note: Zonemaster Engine relies on this feature for its analysis when Ed25519 (DNSKEY algorithm 15) or Ed448 (DNSKEY algorithm 16) is being used in DNSSEC signatures.

IDN

Enabled by default. Disable with --no-idn.

If the IDN feature is enabled, the GNU libidn2 library will be used to add a simple function that converts strings from Perl's internal encoding to IDNA domain name format. In order to convert strings from whatever encoding you have to Perl's internal format, use L. If you need any kind of control or options, use LNet::LibIDN. The included function here is only meant to assist in the most basic case, although that should cover a lot of real-world use cases.

Note: The Zonemaster Engine test suite assumes this feature is enabled.

Internal ldns

Enabled by default. Disable with --no-internal-ldns.

When enabled, an included version of ldns is statically linked into Zonemaster::LDNS. When disabled, libldns is dynamically linked just like other dependencies.

Randomized capitalization

Disabled by default. Enable with --randomize.

Note: This feature is experimental.

Randomizes the capitalization of returned domain names.

Custom OpenSSL

Disabled by default. Enabled with --prefix-openssl=/path/to/openssl or --openssl-inc=/path/to/openssl_inc or --openssl-lib=/path/to/openssl_lib.

Enabling this makes the build tools look for OpenSSL in a non-standard place.

Technically this does two things:

  • Libcrypto is sought in the lib directory under the given directory.
  • The include directory under the given directory is added to the include path.

Note: The lib directory under the given path must be known to the dynamic linker or feature checks will fail.

If both headers and libraries directories (include and lib) are not in the same parent directory, use --openssl-inc and --openssl-lib options to specify both paths.

Custom LDNS

Disabled by default. Enabled with --ldns-inc=/path/to/ldns_inc or --ldns-lib=/path/to/ldns_lib.

Enabling this makes the build tools look for LDNS in a non-standard place.

Requires Internal LDNS to be disabled.

Custom Libidn

Disabled by default. Enabled with --libidn-inc=/path/to/libidn_inc or --libidn-lib=/path/to/ldns_lib.

Enabling this makes the build tools look for Libidn in a non-standard place.

Requires IDN to be enabled.

Debug

Disabled by default. Enabled with --debug.

Gives a more verbose output.

License

This is free software under a 2-clause BSD license. The full text of the license can be found in the LICENSE file included in this respository.