PowerDNS Recursor
-----------------
For full details, please read https://doc.powerdns.com/md/recursor/

Here follow some brief notes that may be useful to get you going.

Compiling
---------
Starting with version 4.0.0, the PowerDNS recursor uses autotools and compiling
[from the tarball](https://downloads.powerdns.com/releases/) can be as simple as

```sh
./configure
make
```

As for dependencies, Boost (http://boost.org/), OpenSSL (https://openssl.org/),
and Lua (https://www.lua.org/) are required.

On most modern UNIX distributions, you can simply install 'boost' or
'boost-dev' or 'boost-devel'. Otherwise, just download boost, and point the
compiler at the right directory using CPPFLAGS.

On Debian and Ubuntu, the following will get you the dependencies:

```sh
apt-get install libboost-dev libboost-filesystem-dev libboost-serialization-dev \
  libboost-system-dev libboost-thread-dev libboost-context-dev libboost-test-dev \
  libssl-dev libboost-test-dev g++ make pkg-config libluajit-5.1-dev
```

Compiling from git checkout
===========================
Source code is available on GitHub:

```sh
git clone https://github.com/PowerDNS/pdns.git
```

This repository contains the sources for the PowerDNS Recursor, the PowerDNS
Authoritative Server, and dnsdist (a powerful DNS loadbalancer). The sources for
the recursor are located in the `pdns/recursordist` subdirectory of the repository.

To compile from a git checkout, install the dependencies above plus ragel, automake, autoconf, libtool, virtualenv and curl.
Then run

```sh
cd pdns/pdns/recursordist/
autoreconf -vi
./configure
make
```

macOS Notes
-----------

If you want to compile yourself, the dependencies can be installed using
Homebrew. You need to tell configure where to find OpenSSL, too.

```sh
brew install boost lua pkg-config ragel openssl
./configure --with-lua PKG_CONFIG_PATH=/usr/local/opt/openssl/lib/pkgconfig
make -j4
```

Lua scripting
-------------
To benefit from Lua scripting, as described on https://doc.powerdns.com/md/recursor/scripting/
Install Lua and development headers. PowerDNS supports Lua 5.1, 5.2, 5.3 and LuaJIT.
On Debian/Ubuntu, install e.g. `liblua5.2-dev` to use Lua 5.2.

The configure script will automatically detect the Lua version. If more than one
version of Lua is installed, the `--with-lua` configure flag can be set to the
desired version. e.g.:

```sh
./configure --with-lua=lua51
```

(On older versions of Debian/Ubuntu, you'll need to pass `--with-lua=lua5.1` instead.)

Documentation
=============
After compiling, run `pdns\_recursor --config` to view the configuration options
and a short description. The full documentation is online at
https://doc.powerdns.com/recursor/

Reporting bugs
==============
Bugs can be reported on GitHub: https://github.com/PowerDNS/pdns/issues, please
check first if your issue is not fixed in the latest version or has already been
reported.

License
=======
PowerDNS is copyright © 2001-2019 by PowerDNS.COM BV and lots of
contributors, using the GNU GPLv2 license (see NOTICE for the
exact license and exception used).

Third party software
====================
We use code from the following projects:

Protozero
---------
protozero copyright (c) Mapbox.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the
      distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.