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===============================================
PySubnetTree - A Python Module for CIDR Lookups
===============================================
.. rst-class:: opening
The PySubnetTree package provides a Python data structure
``SubnetTree`` which maps subnets given in `CIDR
<http://tools.ietf.org/html/rfc4632>`_ notation (incl.
corresponding IPv6 versions) to Python objects. Lookups are
performed by longest-prefix matching.
Download
--------
You can find the latest PySubnetTree release for download at
http://www.bro.org/download.
PySubnetTree's git repository is located at `git://git.bro.org/pysubnettree.git
<git://git.bro.org/pysubnettree.git>`__. You can browse the repository
`here <http://git.bro.org/pysubnettree.git>`__.
This document describes PySubnetTree |version|. See the ``CHANGES``
file for version history.
Example
-------
A simple example which associates CIDR prefixes with strings::
>>> import SubnetTree
>>> t = SubnetTree.SubnetTree()
>>> t["10.1.0.0/16"] = "Network 1"
>>> t["10.1.42.0/24"] = "Network 1, Subnet 42"
>>> print("10.1.42.1" in t)
True
>>> print(t["10.1.42.1"])
Network 1, Subnet 42
>>> print(t["10.1.43.1"])
Network 1
>>> print("10.20.1.1" in t)
False
>>> try:
... print(t["10.20.1.1"])
... except KeyError as err:
... print("Error: %s not found" % err)
Error: '10.20.1.1' not found
PySubnetTree also supports IPv6 addresses and prefixes::
>>> import SubnetTree
>>> t = SubnetTree.SubnetTree()
>>> t["2001:db8::/32"] = "Company 1"
>>> t["2001:db8:4000::/48"] = "Company 1, Site 1"
>>> t["2001:db8:4000:abcd::"]
Company 1, Site 1
>>> t["2001:db8:fe:1234::"]
Company 1
By default, CIDR prefixes and IP addresses are given as strings.
Alternatively, a ``SubnetTree`` object can be switched into *binary
mode*, in which single addresses are passed in the form of packed
binary strings as, e.g., returned by `socket.inet_aton
<http://docs.python.org/2/library/socket.html#socket.inet_aton>`_::
>>> t.get_binary_lookup_mode()
False
>>> t.set_binary_lookup_mode(True)
>>> t.get_binary_lookup_mode()
True
>>> import socket
>>> print(t[socket.inet_aton("10.1.42.1")])
Network 1, Subnet 42
A SubnetTree also provides methods ``insert(prefix,object=None)`` for insertion
of prefixes (``object`` can be skipped to use the tree like a set), and
``remove(prefix)`` for removing entries (``remove`` performs an _exact_ match
rather than longest-prefix).
Internally, the CIDR prefixes of a ``SubnetTree`` are managed by a
Patricia tree data structure and lookups are therefore efficient
even with a large number of prefixes.
PySubnetTree comes with a BSD license.
Prerequisites
-------------
This package requires Python 2.4 or newer.
Installation
------------
Installation is pretty simple::
> python setup.py install
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