40 lines
2.2 KiB
ReStructuredText
40 lines
2.2 KiB
ReStructuredText
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Introduction
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===================================
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**Unbound**
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`Unbound`_ is an implementation of a DNS resolver, that performs caching and 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 well as obtain other information.
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Since the resolver allows to specify the class and type of a query (A record, 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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The pyUnbound is an extension module for Python which provides an 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 context) and :class:`unbound.ub_result` which contains the validation and resolution results.
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The objects are thread-safe, and a context can be used in non-threaded as well 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 can go on, while the results become available later.
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**Features**
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* customizable caching validation resolver for synchronous and asynchronous 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 (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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* DNS-based applications performing DNS lookups; the caching resolver can 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 rejection, connection rejection, ...) using the dynamic local zone manipulation
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