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<h1>Source code for nmb.NetBIOS</h1><div class="highlight"><pre>
<span></span>
<span class="kn">import</span> <span class="nn">os</span><span class="o">,</span> <span class="nn">logging</span><span class="o">,</span> <span class="nn">random</span><span class="o">,</span> <span class="nn">socket</span><span class="o">,</span> <span class="nn">time</span><span class="o">,</span> <span class="nn">select</span>
<span class="kn">from</span> <span class="nn">.base</span> <span class="kn">import</span> <span class="n">NBNS</span><span class="p">,</span> <span class="n">NotConnectedError</span>
<span class="kn">from</span> <span class="nn">.nmb_constants</span> <span class="kn">import</span> <span class="n">TYPE_CLIENT</span><span class="p">,</span> <span class="n">TYPE_SERVER</span><span class="p">,</span> <span class="n">TYPE_WORKSTATION</span>
<div class="viewcode-block" id="NetBIOS"><a class="viewcode-back" href="../../api/nmb_NetBIOS.html#nmb.NetBIOS.NetBIOS">[docs]</a><span class="k">class</span> <span class="nc">NetBIOS</span><span class="p">(</span><span class="n">NBNS</span><span class="p">):</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s1">'NMB.NetBIOS'</span><span class="p">)</span>
<div class="viewcode-block" id="NetBIOS.__init__"><a class="viewcode-back" href="../../api/nmb_NetBIOS.html#nmb.NetBIOS.NetBIOS.__init__">[docs]</a> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">broadcast</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span> <span class="n">listen_port</span> <span class="o">=</span> <span class="mi">0</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Instantiate a NetBIOS instance, and creates a IPv4 UDP socket to listen/send NBNS packets.</span>
<span class="sd"> :param boolean broadcast: A boolean flag to indicate if we should setup the listening UDP port in broadcast mode</span>
<span class="sd"> :param integer listen_port: Specifies the UDP port number to bind to for listening. If zero, OS will automatically select a free port number.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">broadcast</span> <span class="o">=</span> <span class="n">broadcast</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sock</span> <span class="o">=</span> <span class="n">socket</span><span class="o">.</span><span class="n">socket</span><span class="p">(</span><span class="n">socket</span><span class="o">.</span><span class="n">AF_INET</span><span class="p">,</span> <span class="n">socket</span><span class="o">.</span><span class="n">SOCK_DGRAM</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">broadcast</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="o">.</span><span class="n">setsockopt</span><span class="p">(</span><span class="n">socket</span><span class="o">.</span><span class="n">SOL_SOCKET</span><span class="p">,</span> <span class="n">socket</span><span class="o">.</span><span class="n">SO_BROADCAST</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="k">if</span> <span class="n">listen_port</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="o">.</span><span class="n">bind</span><span class="p">((</span> <span class="s1">''</span><span class="p">,</span> <span class="n">listen_port</span> <span class="p">))</span></div>
<div class="viewcode-block" id="NetBIOS.close"><a class="viewcode-back" href="../../api/nmb_NetBIOS.html#nmb.NetBIOS.NetBIOS.close">[docs]</a> <span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Close the underlying and free resources.</span>
<span class="sd"> The NetBIOS instance should not be used to perform any operations after this method returns.</span>
<span class="sd"> :return: None</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sock</span> <span class="o">=</span> <span class="kc">None</span></div>
<span class="k">def</span> <span class="nf">write</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">,</span> <span class="n">ip</span><span class="p">,</span> <span class="n">port</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="p">,</span> <span class="s1">'Socket is already closed'</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="o">.</span><span class="n">sendto</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="p">(</span> <span class="n">ip</span><span class="p">,</span> <span class="n">port</span> <span class="p">))</span>
<div class="viewcode-block" id="NetBIOS.queryName"><a class="viewcode-back" href="../../api/nmb_NetBIOS.html#nmb.NetBIOS.NetBIOS.queryName">[docs]</a> <span class="k">def</span> <span class="nf">queryName</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">ip</span> <span class="o">=</span> <span class="s1">''</span><span class="p">,</span> <span class="n">port</span> <span class="o">=</span> <span class="mi">137</span><span class="p">,</span> <span class="n">timeout</span> <span class="o">=</span> <span class="mi">30</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Send a query on the network and hopes that if machine matching the *name* will reply with its IP address.</span>
<span class="sd"> :param string ip: 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.</span>
<span class="sd"> If the NBNSProtocol instance was instianted with broadcast=False, then you should provide a target IP to send the query.</span>
<span class="sd"> :param integer port: 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.</span>
<span class="sd"> :param integer/float timeout: Number of seconds to wait for a reply, after which the method will return None</span>
<span class="sd"> :return: A list of IP addresses in dotted notation (aaa.bbb.ccc.ddd). On timeout, returns None.</span>
<span class="sd"> """</span>
<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="p">,</span> <span class="s1">'Socket is already closed'</span>
<span class="n">trn_id</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mh">0xFFFF</span><span class="p">)</span>
<span class="n">data</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">prepareNameQuery</span><span class="p">(</span><span class="n">trn_id</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">broadcast</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">ip</span><span class="p">:</span>
<span class="n">ip</span> <span class="o">=</span> <span class="s1">'<broadcast>'</span>
<span class="k">elif</span> <span class="ow">not</span> <span class="n">ip</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s1">'queryName: ip parameter is empty. OS might not transmit this query to the network'</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">ip</span><span class="p">,</span> <span class="n">port</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pollForNetBIOSPacket</span><span class="p">(</span><span class="n">trn_id</span><span class="p">,</span> <span class="n">timeout</span><span class="p">)</span></div>
<div class="viewcode-block" id="NetBIOS.queryIPForName"><a class="viewcode-back" href="../../api/nmb_NetBIOS.html#nmb.NetBIOS.NetBIOS.queryIPForName">[docs]</a> <span class="k">def</span> <span class="nf">queryIPForName</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ip</span><span class="p">,</span> <span class="n">port</span> <span class="o">=</span> <span class="mi">137</span><span class="p">,</span> <span class="n">timeout</span> <span class="o">=</span> <span class="mi">30</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Send a query to the machine with *ip* and hopes that the machine will reply back with its name.</span>
<span class="sd"> The implementation of this function is contributed by Jason Anderson.</span>
<span class="sd"> :param string ip: 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.</span>
<span class="sd"> If the NBNSProtocol instance was instianted with broadcast=False, then you should provide a target IP to send the query.</span>
<span class="sd"> :param integer port: 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.</span>
<span class="sd"> :param integer/float timeout: Number of seconds to wait for a reply, after which the method will return None</span>
<span class="sd"> :return: A list of string containing the names of the machine at *ip*. On timeout, returns None.</span>
<span class="sd"> """</span>
<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="p">,</span> <span class="s1">'Socket is already closed'</span>
<span class="n">trn_id</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mh">0xFFFF</span><span class="p">)</span>
<span class="n">data</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">prepareNetNameQuery</span><span class="p">(</span><span class="n">trn_id</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">ip</span><span class="p">,</span> <span class="n">port</span><span class="p">)</span>
<span class="n">ret</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pollForQueryPacket</span><span class="p">(</span><span class="n">trn_id</span><span class="p">,</span> <span class="n">timeout</span><span class="p">)</span>
<span class="k">if</span> <span class="n">ret</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="k">lambda</span> <span class="n">s</span><span class="p">:</span> <span class="n">s</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="nb">filter</span><span class="p">(</span><span class="k">lambda</span> <span class="n">s</span><span class="p">:</span> <span class="n">s</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">==</span> <span class="n">TYPE_SERVER</span><span class="p">,</span> <span class="n">ret</span><span class="p">)))</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span></div>
<span class="c1">#</span>
<span class="c1"># Protected Methods</span>
<span class="c1">#</span>
<span class="k">def</span> <span class="nf">_pollForNetBIOSPacket</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">wait_trn_id</span><span class="p">,</span> <span class="n">timeout</span><span class="p">):</span>
<span class="n">end_time</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span> <span class="o">-</span> <span class="n">timeout</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">_timeout</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span><span class="o">-</span><span class="n">end_time</span>
<span class="k">if</span> <span class="n">_timeout</span> <span class="o"><=</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="n">ready</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">select</span><span class="p">([</span> <span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="o">.</span><span class="n">fileno</span><span class="p">()</span> <span class="p">],</span> <span class="p">[</span> <span class="p">],</span> <span class="p">[</span> <span class="p">],</span> <span class="n">_timeout</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">ready</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="n">data</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="o">.</span><span class="n">recvfrom</span><span class="p">(</span><span class="mh">0xFFFF</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">data</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">NotConnectedError</span>
<span class="n">trn_id</span><span class="p">,</span> <span class="n">ret</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">decodePacket</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
<span class="k">if</span> <span class="n">trn_id</span> <span class="o">==</span> <span class="n">wait_trn_id</span><span class="p">:</span>
<span class="k">return</span> <span class="n">ret</span>
<span class="k">except</span> <span class="n">select</span><span class="o">.</span><span class="n">error</span> <span class="k">as</span> <span class="n">ex</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="n">ex</span><span class="p">)</span> <span class="ow">is</span> <span class="nb">tuple</span><span class="p">:</span>
<span class="k">if</span> <span class="n">ex</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="n">errno</span><span class="o">.</span><span class="n">EINTR</span> <span class="ow">and</span> <span class="n">ex</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="n">errno</span><span class="o">.</span><span class="n">EAGAIN</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ex</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ex</span>
<span class="c1">#</span>
<span class="c1"># Contributed by Jason Anderson</span>
<span class="c1">#</span>
<span class="k">def</span> <span class="nf">_pollForQueryPacket</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">wait_trn_id</span><span class="p">,</span> <span class="n">timeout</span><span class="p">):</span>
<span class="n">end_time</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span> <span class="o">-</span> <span class="n">timeout</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">_timeout</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span><span class="o">-</span><span class="n">end_time</span>
<span class="k">if</span> <span class="n">_timeout</span> <span class="o"><=</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="n">ready</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">select</span><span class="p">([</span> <span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="o">.</span><span class="n">fileno</span><span class="p">()</span> <span class="p">],</span> <span class="p">[</span> <span class="p">],</span> <span class="p">[</span> <span class="p">],</span> <span class="n">_timeout</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">ready</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="n">data</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">sock</span><span class="o">.</span><span class="n">recvfrom</span><span class="p">(</span><span class="mh">0xFFFF</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">data</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">NotConnectedError</span>
<span class="n">trn_id</span><span class="p">,</span> <span class="n">ret</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">decodeIPQueryPacket</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
<span class="k">if</span> <span class="n">trn_id</span> <span class="o">==</span> <span class="n">wait_trn_id</span><span class="p">:</span>
<span class="k">return</span> <span class="n">ret</span>
<span class="k">except</span> <span class="n">select</span><span class="o">.</span><span class="n">error</span> <span class="k">as</span> <span class="n">ex</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="n">ex</span><span class="p">)</span> <span class="ow">is</span> <span class="nb">tuple</span><span class="p">:</span>
<span class="k">if</span> <span class="n">ex</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="n">errno</span><span class="o">.</span><span class="n">EINTR</span> <span class="ow">and</span> <span class="n">ex</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="n">errno</span><span class="o">.</span><span class="n">EAGAIN</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ex</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ex</span></div>
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