Python interface for c-ares
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deps/c-ares/src core: backport fix for CVE-2016-5180 Oct 3, 2016
docs doc: update Sphinx configuration so the docs can be built Aug 26, 2016
src core: fix parsing chunked TXT records Jun 10, 2016
tests test: add test for setting nameservers Jul 1, 2016
.gitignore build: add egg-info to .gitignore Sep 1, 2015
ChangeLog core: raised version and updated changelog Oct 3, 2016
LICENSE Initial import Jul 7, 2012 build: fix May 25, 2016
README.rst doc: update supported Python versions May 25, 2016
TODO Added socket_send_buffer_size and socket_receive_buffer_size Nov 26, 2012
appveyor.yml ci: build CFFI backend first on AppVeyor Jun 10, 2016
build_inplace Initial import Jul 7, 2012 core: add CFFI core implementation May 24, 2016 Added invoke tasks for helping make releases Mar 26, 2014
tox.ini test: add Python 3.5 to tox.ini May 24, 2016


pycares: Python interface for c-ares

pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously.


Bundled c-ares

pycares currently bundles c-ares and as of pycares 1.0.0 this is a strong requirement. Upstream c-ares is not willing to apply a patch adding TTL support. I did apply the patch to the bundled c-ares, but unfortunately it breaks the ABI, so attempting to use a system provided c-ares is not possible.




Mac OSX:

(XCode needs to be installed)
export ARCHFLAGS="-arch x86_64"

Microsoft Windows (with Visual Studio 2008, 2010, 2015 or the Windows SDK):


Running the test suite

There are several ways of running the test ruite:

  • Run the test with the current Python interpreter:

    From the toplevel directory, run: python tests/

  • Use Tox to run the test suite in several virtualenvs with several interpreters

    From the toplevel directory, run: tox -e py27,py33,py34,py35 this will run the test suite on Python 2.7, 3.3, 3.4 and 3.5 (you'll need to have them installed beforehand)


Saúl Ibarra Corretgé <>


Unless stated otherwise on-file pycares uses the MIT license, check LICENSE file.

Python versions

Python >= 2.7 and >= 3.3 are supported. Other older versions might work too, but they are not actively tested. Both CPython and PyPy (tested with version 5) are supported.


If you'd like to contribute, fork the project, make a patch and send a pull request. Have a look at the surrounding code and please, make yours look alike :-)