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<div class="section" id="nbnsprotocol-class">
<h1>NBNSProtocol Class<a class="headerlink" href="#nbnsprotocol-class" title="Permalink to this headline">¶</a></h1>
<p>pysmb has a <em>NBNSProtocol</em> implementation for Twisted framework.
This allows you to perform name query asynchronously without having your application to block and wait for the results.</p>
<dl class="docutils">
<dt>In your project,</dt>
<dd><ol class="first last arabic simple">
<li>Create a NBNSProtocol instance.</li>
<li>Just call <em>queryName</em> method which will return a <em>Deferred</em> instance. Add your callback function to the <em>Deferred</em> instance via <em>addCallback</em> method to receive the results of the name query.</li>
<li>When you are done with the NBNSProtocol instance, call its <NBNSProtocol instance>.transport.stopListening method to remove this instance from the reactor.</li>
</ol>
</dd>
</dl>
<dl class="class">
<dt id="nmb.NetBIOSProtocol.NBNSProtocol">
<em class="property">class </em><code class="descclassname">nmb.NetBIOSProtocol.</code><code class="descname">NBNSProtocol</code><span class="sig-paren">(</span><em>broadcast=True</em>, <em>listen_port=0</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/nmb/NetBIOSProtocol.html#NBNSProtocol"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#nmb.NetBIOSProtocol.NBNSProtocol" title="Permalink to this definition">¶</a></dt>
<dd><dl class="method">
<dt id="nmb.NetBIOSProtocol.NBNSProtocol.__init__">
<code class="descname">__init__</code><span class="sig-paren">(</span><em>broadcast=True</em>, <em>listen_port=0</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/nmb/NetBIOSProtocol.html#NBNSProtocol.__init__"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#nmb.NetBIOSProtocol.NBNSProtocol.__init__" title="Permalink to this definition">¶</a></dt>
<dd><p>Instantiate a NBNSProtocol instance.</p>
<p>This automatically calls reactor.listenUDP method to start listening for incoming packets, so you <strong>must not</strong> call the listenUDP method again.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>broadcast</strong> (<em>boolean</em>) – A boolean flag to indicate if we should setup the listening UDP port in broadcast mode</li>
<li><strong>listen_port</strong> (<em>integer</em>) – Specifies the UDP port number to bind to for listening. If zero, OS will automatically select a free port number.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="nmb.NetBIOSProtocol.NBNSProtocol.queryIPForName">
<code class="descname">queryIPForName</code><span class="sig-paren">(</span><em>ip</em>, <em>port=137</em>, <em>timeout=30</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/nmb/NetBIOSProtocol.html#NBNSProtocol.queryIPForName"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#nmb.NetBIOSProtocol.NBNSProtocol.queryIPForName" title="Permalink to this definition">¶</a></dt>
<dd><p>Send a query to the machine with <em>ip</em> and hopes that the machine will reply back with its name.</p>
<p>The implementation of this function is contributed by Jason Anderson.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>ip</strong> (<em>string</em>) – If the NBNSProtocol instance was instianted with broadcast=True, then this parameter can be an empty string. We will leave it to the OS to determine an appropriate broadcast address.
If the NBNSProtocol instance was instianted with broadcast=False, then you should provide a target IP to send the query.</li>
<li><strong>port</strong> (<em>integer</em>) – The NetBIOS-NS port (IANA standard defines this port to be 137). You should not touch this parameter unless you know what you are doing.</li>
<li><strong>timeout</strong> (<em>integer/float</em>) – Number of seconds to wait for a reply, after which the method will return None</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">A <em>twisted.internet.defer.Deferred</em> instance. The callback function will be called with a list of names of the machine at <em>ip</em>.
On timeout, the errback function will be called with a Failure instance wrapping around a NetBIOSTimeout exception</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="nmb.NetBIOSProtocol.NBNSProtocol.queryName">
<code class="descname">queryName</code><span class="sig-paren">(</span><em>name</em>, <em>ip=''</em>, <em>port=137</em>, <em>timeout=30</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/nmb/NetBIOSProtocol.html#NBNSProtocol.queryName"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#nmb.NetBIOSProtocol.NBNSProtocol.queryName" title="Permalink to this definition">¶</a></dt>
<dd><p>Send a query on the network and hopes that if machine matching the <em>name</em> will reply with its IP address.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>ip</strong> (<em>string</em>) – If the NBNSProtocol instance was instianted with broadcast=True, then this parameter can be an empty string. We will leave it to the OS to determine an appropriate broadcast address.
If the NBNSProtocol instance was instianted with broadcast=False, then you should provide a target IP to send the query.</li>
<li><strong>port</strong> (<em>integer</em>) – The NetBIOS-NS port (IANA standard defines this port to be 137). You should not touch this parameter unless you know what you are doing.</li>
<li><strong>timeout</strong> (<em>integer/float</em>) – Number of seconds to wait for a reply, after which the returned Deferred instance will be called with a NetBIOSTimeout exception.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">A <em>twisted.internet.defer.Deferred</em> instance. The callback function will be called with a list of IP addresses in dotted notation (aaa.bbb.ccc.ddd).
On timeout, the errback function will be called with a Failure instance wrapping around a NetBIOSTimeout exception</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="nmb.NetBIOSProtocol.NetBIOSTimeout">
<em class="property">class </em><code class="descclassname">nmb.NetBIOSProtocol.</code><code class="descname">NetBIOSTimeout</code><a class="reference internal" href="../_modules/nmb/NetBIOSProtocol.html#NetBIOSTimeout"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#nmb.NetBIOSProtocol.NetBIOSTimeout" title="Permalink to this definition">¶</a></dt>
<dd><p>Raised in NBNSProtocol via Deferred.errback method when queryName method has timeout waiting for reply</p>
</dd></dl>
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