2014-10-06 00:44:31 +03:00
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Introduction
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2017-06-16 13:16:05 +03:00
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============
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Unbound
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-------
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`Unbound`_ is an implementation of a DNS resolver, that performs caching and
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DNSSEC validation.
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Together with unbound, the libunbound library is provided.
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This library can be used to convert hostnames to ip addresses, and back, as
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well as obtain other information.
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Since the resolver allows to specify the class and type of a query (A record,
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NS, MX, ...), this library offers powerful resolving tool.
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The library also performs public-key validation of results with DNSSEC.
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.. _Unbound: http://www.unbound.net/documentation
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pyUnbound
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---------
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The pyUnbound is an extension module for Python which provides an
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object-oriented interface to libunbound.
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It is the first Python module which offers thread-safe caching resolver.
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The interface was designed with the emphasis on the simplicity of use.
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There are two main classes :class:`unbound.ub_ctx` (a validation and resolution
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context) and :class:`unbound.ub_result` which contains the validation and
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resolution results.
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The objects are thread-safe, and a context can be used in non-threaded as well
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as threaded environment.
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Resolution can be performed blocking and non-blocking (i.e. asynchronous).
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The asynchronous method returns from the call immediately, so that processing
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can go on, while the results become available later.
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Features
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--------
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* Customizable caching validation resolver for synchronous and asynchronous
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lookups
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* Easy to use object interface
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* Easy to integrate extension module
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* Designed for thread environment (i.e. thread-safe)
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* Allows define and customize of local zone and its RR's during the operation
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(i.e. without restart)
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* Includes encoding functions to simplify the results retrieval
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* Internationalized domain name (`IDN`_) support
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.. _IDN: http://en.wikipedia.org/wiki/Internationalized_domain_name
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Application area
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----------------
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* DNS-based applications performing DNS lookups; the caching resolver can
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reduce overhead
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* Applications where the validation of DNS records is required
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* Great solution for customizable and dynamic DNS-based white/blacklists (spam
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rejection, connection rejection, ...) using the dynamic local zone
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manipulation
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