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  66   <h1>Source code for nepi.resources.linux.tunnel</h1><div class="highlight"><pre>
  67 <span class="c">#</span>
  68 <span class="c">#    NEPI, a framework to manage network experiments</span>
  69 <span class="c">#    Copyright (C) 2013 INRIA</span>
  70 <span class="c">#</span>
  71 <span class="c">#    This program is free software: you can redistribute it and/or modify</span>
  72 <span class="c">#    it under the terms of the GNU General Public License version 2 as</span>
  73 <span class="c">#    published by the Free Software Foundation;</span>
  74 <span class="c">#</span>
  75 <span class="c">#    This program is distributed in the hope that it will be useful,</span>
  76 <span class="c">#    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
  77 <span class="c">#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
  78 <span class="c">#    GNU General Public License for more details.</span>
  79 <span class="c">#</span>
  80 <span class="c">#    You should have received a copy of the GNU General Public License</span>
  81 <span class="c">#    along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
  82 <span class="c">#</span>
  83 <span class="c"># Author: Alina Quereilhac &lt;alina.quereilhac@inria.fr&gt;</span>
  84
  85 <span class="kn">from</span> <span class="nn">nepi.execution.resource</span> <span class="kn">import</span> <span class="n">clsinit_copy</span><span class="p">,</span> <span class="n">ResourceState</span>
  86 <span class="kn">from</span> <span class="nn">nepi.resources.linux.application</span> <span class="kn">import</span> <span class="n">LinuxApplication</span>
  87 <span class="kn">from</span> <span class="nn">nepi.util.timefuncs</span> <span class="kn">import</span> <span class="n">tnow</span><span class="p">,</span> <span class="n">tdiffsec</span>
  88
  89 <span class="kn">import</span> <span class="nn">os</span>
  90 <span class="kn">import</span> <span class="nn">time</span>
  91
  92 <span class="n">state_check_delay</span> <span class="o">=</span> <span class="mf">0.5</span>
  93
  94 <span class="nd">@clsinit_copy</span>
  95 <div class="viewcode-block" id="LinuxTunnel"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel">[docs]</a><span class="k">class</span> <span class="nc">LinuxTunnel</span><span class="p">(</span><span class="n">LinuxApplication</span><span class="p">):</span>
  96     <span class="n">_rtype</span> <span class="o">=</span> <span class="s">&quot;abstract::linux::Tunnel&quot;</span>
  97     <span class="n">_help</span> <span class="o">=</span> <span class="s">&quot;Constructs a tunnel between two Linux endpoints&quot;</span>
  98
  99     <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ec</span><span class="p">,</span> <span class="n">guid</span><span class="p">):</span>
 100         <span class="nb">super</span><span class="p">(</span><span class="n">LinuxTunnel</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="n">guid</span><span class="p">)</span>
 101         <span class="bp">self</span><span class="o">.</span><span class="n">_home</span> <span class="o">=</span> <span class="s">&quot;tunnel-</span><span class="si">%s</span><span class="s">&quot;</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">guid</span>
 102
 103 <div class="viewcode-block" id="LinuxTunnel.log_message"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.log_message">[docs]</a>    <span class="k">def</span> <span class="nf">log_message</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">msg</span><span class="p">):</span>
 104         <span class="k">return</span> <span class="s">&quot; guid </span><span class="si">%d</span><span class="s"> - tunnel </span><span class="si">%s</span><span class="s"> - </span><span class="si">%s</span><span class="s"> - </span><span class="si">%s</span><span class="s"> &quot;</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">guid</span><span class="p">,</span>
 105                 <span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="o">.</span><span class="n">node</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">&quot;hostname&quot;</span><span class="p">),</span>
 106                 <span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="o">.</span><span class="n">node</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">&quot;hostname&quot;</span><span class="p">),</span>
 107                 <span class="n">msg</span><span class="p">)</span>
 108 </div>
 109 <div class="viewcode-block" id="LinuxTunnel.get_endpoints"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.get_endpoints">[docs]</a>    <span class="k">def</span> <span class="nf">get_endpoints</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
 110         <span class="sd">&quot;&quot;&quot; Returns the list of RM that are endpoints to the tunnel </span>
 111 <span class="sd">        &quot;&quot;&quot;</span>
 112         <span class="k">raise</span> <span class="ne">NotImplementedError</span>
 113 </div>
 114     <span class="nd">@property</span>
 115 <div class="viewcode-block" id="LinuxTunnel.endpoint1"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.endpoint1">[docs]</a>    <span class="k">def</span> <span class="nf">endpoint1</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
 116         <span class="n">endpoints</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_endpoints</span><span class="p">()</span>
 117         <span class="k">if</span> <span class="n">endpoints</span><span class="p">:</span> <span class="k">return</span> <span class="n">endpoints</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
 118         <span class="k">return</span> <span class="bp">None</span>
 119 </div>
 120     <span class="nd">@property</span>
 121 <div class="viewcode-block" id="LinuxTunnel.endpoint2"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.endpoint2">[docs]</a>    <span class="k">def</span> <span class="nf">endpoint2</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
 122         <span class="n">endpoints</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_endpoints</span><span class="p">()</span>
 123         <span class="k">if</span> <span class="n">endpoints</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">endpoints</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">1</span><span class="p">:</span> <span class="k">return</span> <span class="n">endpoints</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
 124         <span class="k">return</span> <span class="bp">None</span>
 125 </div>
 126 <div class="viewcode-block" id="LinuxTunnel.app_home"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.app_home">[docs]</a>    <span class="k">def</span> <span class="nf">app_home</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">endpoint</span><span class="p">):</span>
 127         <span class="k">return</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">endpoint</span><span class="o">.</span><span class="n">node</span><span class="o">.</span><span class="n">exp_home</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_home</span><span class="p">)</span>
 128 </div>
 129 <div class="viewcode-block" id="LinuxTunnel.run_home"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.run_home">[docs]</a>    <span class="k">def</span> <span class="nf">run_home</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">endpoint</span><span class="p">):</span>
 130         <span class="k">return</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">app_home</span><span class="p">(</span><span class="n">endpoint</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">ec</span><span class="o">.</span><span class="n">run_id</span><span class="p">)</span>
 131 </div>
 132 <div class="viewcode-block" id="LinuxTunnel.endpoint_mkdir"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.endpoint_mkdir">[docs]</a>    <span class="k">def</span> <span class="nf">endpoint_mkdir</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">endpoint</span><span class="p">):</span>
 133         <span class="n">endpoint</span><span class="o">.</span><span class="n">node</span><span class="o">.</span><span class="n">mkdir</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">run_home</span><span class="p">(</span><span class="n">endpoint</span><span class="p">))</span>
 134 </div>
 135 <div class="viewcode-block" id="LinuxTunnel.initiate_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.initiate_connection">[docs]</a>    <span class="k">def</span> <span class="nf">initiate_connection</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">endpoint</span><span class="p">,</span> <span class="n">remote_endpoint</span><span class="p">):</span>
 136         <span class="k">raise</span> <span class="ne">NotImplementedError</span>
 137 </div>
 138 <div class="viewcode-block" id="LinuxTunnel.establish_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.establish_connection">[docs]</a>    <span class="k">def</span> <span class="nf">establish_connection</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">endpoint</span><span class="p">,</span> <span class="n">remote_endpoint</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
 139         <span class="k">raise</span> <span class="ne">NotImplementedError</span>
 140 </div>
 141 <div class="viewcode-block" id="LinuxTunnel.verify_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.verify_connection">[docs]</a>    <span class="k">def</span> <span class="nf">verify_connection</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">endpoint</span><span class="p">,</span> <span class="n">remote_endpoint</span><span class="p">):</span>
 142         <span class="k">raise</span> <span class="ne">NotImplementedError</span>
 143 </div>
 144 <div class="viewcode-block" id="LinuxTunnel.terminate_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.terminate_connection">[docs]</a>    <span class="k">def</span> <span class="nf">terminate_connection</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">endpoint</span><span class="p">,</span> <span class="n">remote_endpoint</span><span class="p">):</span>
 145         <span class="k">raise</span> <span class="ne">NotImplementedError</span>
 146 </div>
 147 <div class="viewcode-block" id="LinuxTunnel.check_state_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.check_state_connection">[docs]</a>    <span class="k">def</span> <span class="nf">check_state_connection</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">endpoint</span><span class="p">,</span> <span class="n">remote_endpoint</span><span class="p">):</span>
 148         <span class="k">raise</span> <span class="ne">NotImplementedError</span>
 149 </div>
 150 <div class="viewcode-block" id="LinuxTunnel.do_provision"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.do_provision">[docs]</a>    <span class="k">def</span> <span class="nf">do_provision</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
 151         <span class="c"># create run dir for tunnel on each node </span>
 152         <span class="bp">self</span><span class="o">.</span><span class="n">endpoint_mkdir</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">)</span>
 153         <span class="bp">self</span><span class="o">.</span><span class="n">endpoint_mkdir</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">)</span>
 154
 155         <span class="bp">self</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s">&quot;Initiate the connection&quot;</span><span class="p">)</span>
 156         <span class="c"># Start 2 step connection</span>
 157         <span class="c"># Initiate connection from endpoint 1 to endpoint 2</span>
 158         <span class="n">data1</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">initiate_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">)</span>
 159
 160         <span class="c"># Initiate connection from endpoint 2 to endpoint 1</span>
 161         <span class="n">data2</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">initiate_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">)</span>
 162
 163         <span class="bp">self</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s">&quot;Establish the connection&quot;</span><span class="p">)</span>
 164         <span class="c"># Establish connection from endpoint 1 to endpoint 2</span>
 165         <span class="bp">self</span><span class="o">.</span><span class="n">establish_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">,</span> <span class="n">data2</span><span class="p">)</span>
 166
 167         <span class="c"># Establish connection from endpoint 2 to endpoint 1</span>
 168         <span class="bp">self</span><span class="o">.</span><span class="n">establish_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">,</span> <span class="n">data1</span><span class="p">)</span>
 169
 170         <span class="bp">self</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s">&quot;Verify the connection&quot;</span><span class="p">)</span>
 171         <span class="c"># check if connection was successful on both sides</span>
 172         <span class="bp">self</span><span class="o">.</span><span class="n">verify_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">)</span>
 173         <span class="bp">self</span><span class="o">.</span><span class="n">verify_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">)</span>
 174
 175         <span class="bp">self</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">&quot;Provisioning finished&quot;</span><span class="p">)</span>
 176
 177         <span class="bp">self</span><span class="o">.</span><span class="n">set_provisioned</span><span class="p">()</span>
 178 </div>
 179 <div class="viewcode-block" id="LinuxTunnel.do_deploy"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.do_deploy">[docs]</a>    <span class="k">def</span> <span class="nf">do_deploy</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
 180         <span class="k">if</span> <span class="p">(</span><span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="o">.</span><span class="n">state</span> <span class="o">&lt;</span> <span class="n">ResourceState</span><span class="o">.</span><span class="n">READY</span><span class="p">)</span> <span class="ow">or</span> \
 181             <span class="p">(</span><span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="o">.</span><span class="n">state</span> <span class="o">&lt;</span> <span class="n">ResourceState</span><span class="o">.</span><span class="n">READY</span><span class="p">):</span>
 182             <span class="bp">self</span><span class="o">.</span><span class="n">ec</span><span class="o">.</span><span class="n">schedule</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">reschedule_delay</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">deploy</span><span class="p">)</span>
 183         <span class="k">else</span><span class="p">:</span>
 184             <span class="bp">self</span><span class="o">.</span><span class="n">do_discover</span><span class="p">()</span>
 185             <span class="bp">self</span><span class="o">.</span><span class="n">do_provision</span><span class="p">()</span>
 186
 187             <span class="bp">self</span><span class="o">.</span><span class="n">set_ready</span><span class="p">()</span>
 188 </div>
 189 <div class="viewcode-block" id="LinuxTunnel.do_start"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.do_start">[docs]</a>    <span class="k">def</span> <span class="nf">do_start</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
 190         <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">state</span> <span class="o">==</span> <span class="n">ResourceState</span><span class="o">.</span><span class="n">READY</span><span class="p">:</span>
 191             <span class="n">command</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">&quot;command&quot;</span><span class="p">)</span>
 192             <span class="bp">self</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">&quot;Starting command &#39;</span><span class="si">%s</span><span class="s">&#39;&quot;</span> <span class="o">%</span> <span class="n">command</span><span class="p">)</span>
 193
 194             <span class="bp">self</span><span class="o">.</span><span class="n">set_started</span><span class="p">()</span>
 195         <span class="k">else</span><span class="p">:</span>
 196             <span class="n">msg</span> <span class="o">=</span> <span class="s">&quot; Failed to execute command &#39;</span><span class="si">%s</span><span class="s">&#39;&quot;</span> <span class="o">%</span> <span class="n">command</span>
 197             <span class="bp">self</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="n">out</span><span class="p">,</span> <span class="n">err</span><span class="p">)</span>
 198             <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">,</span> <span class="n">msg</span>
 199 </div>
 200 <div class="viewcode-block" id="LinuxTunnel.do_stop"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.do_stop">[docs]</a>    <span class="k">def</span> <span class="nf">do_stop</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
 201         <span class="sd">&quot;&quot;&quot; Stops application execution</span>
 202 <span class="sd">        &quot;&quot;&quot;</span>
 203
 204         <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">state</span> <span class="o">==</span> <span class="n">ResourceState</span><span class="o">.</span><span class="n">STARTED</span><span class="p">:</span>
 205             <span class="bp">self</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">&quot;Stopping tunnel&quot;</span><span class="p">)</span>
 206
 207             <span class="bp">self</span><span class="o">.</span><span class="n">terminate_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">)</span>
 208             <span class="bp">self</span><span class="o">.</span><span class="n">terminate_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">)</span>
 209
 210             <span class="bp">self</span><span class="o">.</span><span class="n">set_stopped</span><span class="p">()</span>
 211 </div>
 212     <span class="nd">@property</span>
 213 <div class="viewcode-block" id="LinuxTunnel.state"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.state">[docs]</a>    <span class="k">def</span> <span class="nf">state</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
 214         <span class="sd">&quot;&quot;&quot; Returns the state of the application</span>
 215 <span class="sd">        &quot;&quot;&quot;</span>
 216         <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_state</span> <span class="o">==</span> <span class="n">ResourceState</span><span class="o">.</span><span class="n">STARTED</span><span class="p">:</span>
 217             <span class="c"># In order to avoid overwhelming the remote host and</span>
 218             <span class="c"># the local processor with too many ssh queries, the state is only</span>
 219             <span class="c"># requested every &#39;state_check_delay&#39; seconds.</span>
 220             <span class="k">if</span> <span class="n">tdiffsec</span><span class="p">(</span><span class="n">tnow</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_last_state_check</span><span class="p">)</span> <span class="o">&gt;</span> <span class="n">state_check_delay</span><span class="p">:</span>
 221
 222                 <span class="bp">self</span><span class="o">.</span><span class="n">check_state_connection</span><span class="p">()</span>
 223
 224                 <span class="bp">self</span><span class="o">.</span><span class="n">_last_state_check</span> <span class="o">=</span> <span class="n">tnow</span><span class="p">()</span>
 225
 226         <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_state</span>
 227 </div>
 228 <div class="viewcode-block" id="LinuxTunnel.valid_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.tunnel.LinuxTunnel.valid_connection">[docs]</a>    <span class="k">def</span> <span class="nf">valid_connection</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">guid</span><span class="p">):</span>
 229         <span class="c"># TODO: Validate!</span>
 230         <span class="k">return</span> <span class="bp">True</span>
 231 </pre></div></div></div>
 232
 233           </div>
 234         </div>
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