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  66   <h1>Source code for nepi.resources.linux.udptunnel</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.attribute</span> <span class="kn">import</span> <span class="n">Attribute</span><span class="p">,</span> <span class="n">Flags</span><span class="p">,</span> <span class="n">Types</span>
  86 <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>
  87 <span class="kn">from</span> <span class="nn">nepi.resources.linux.tunnel</span> <span class="kn">import</span> <span class="n">LinuxTunnel</span>
  88 <span class="kn">from</span> <span class="nn">nepi.util.sshfuncs</span> <span class="kn">import</span> <span class="n">ProcStatus</span>
  89 <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>
  90
  91 <span class="kn">import</span> <span class="nn">os</span>
  92 <span class="kn">import</span> <span class="nn">socket</span>
  93 <span class="kn">import</span> <span class="nn">time</span>
  94
  95 <span class="nd">@clsinit_copy</span>
  96 <div class="viewcode-block" id="LinuxUdpTunnel"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.udptunnel.LinuxUdpTunnel">[docs]</a><span class="k">class</span> <span class="nc">LinuxUdpTunnel</span><span class="p">(</span><span class="n">LinuxTunnel</span><span class="p">):</span>
  97     <span class="n">_rtype</span> <span class="o">=</span> <span class="s">&quot;linux::UdpTunnel&quot;</span>
  98     <span class="n">_help</span> <span class="o">=</span> <span class="s">&quot;Constructs a tunnel between two Linux endpoints using a UDP connection &quot;</span>
  99     <span class="n">_platform</span> <span class="o">=</span> <span class="s">&quot;linux&quot;</span>
 100
 101     <span class="nd">@classmethod</span>
 102     <span class="k">def</span> <span class="nf">_register_attributes</span><span class="p">(</span><span class="n">cls</span><span class="p">):</span>
 103         <span class="n">cipher</span> <span class="o">=</span> <span class="n">Attribute</span><span class="p">(</span><span class="s">&quot;cipher&quot;</span><span class="p">,</span>
 104                <span class="s">&quot;Cipher to encript communication. &quot;</span>
 105                 <span class="s">&quot;One of PLAIN, AES, Blowfish, DES, DES3. &quot;</span><span class="p">,</span>
 106                 <span class="n">default</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span>
 107                 <span class="n">allowed</span> <span class="o">=</span> <span class="p">[</span><span class="s">&quot;PLAIN&quot;</span><span class="p">,</span> <span class="s">&quot;AES&quot;</span><span class="p">,</span> <span class="s">&quot;Blowfish&quot;</span><span class="p">,</span> <span class="s">&quot;DES&quot;</span><span class="p">,</span> <span class="s">&quot;DES3&quot;</span><span class="p">],</span>
 108                 <span class="nb">type</span> <span class="o">=</span> <span class="n">Types</span><span class="o">.</span><span class="n">Enumerate</span><span class="p">,</span>
 109                 <span class="n">flags</span> <span class="o">=</span> <span class="n">Flags</span><span class="o">.</span><span class="n">Design</span><span class="p">)</span>
 110
 111         <span class="n">cipher_key</span> <span class="o">=</span> <span class="n">Attribute</span><span class="p">(</span><span class="s">&quot;cipherKey&quot;</span><span class="p">,</span>
 112                 <span class="s">&quot;Specify a symmetric encryption key with which to protect &quot;</span>
 113                 <span class="s">&quot;packets across the tunnel. python-crypto must be installed &quot;</span>
 114                 <span class="s">&quot;on the system.&quot;</span> <span class="p">,</span>
 115                 <span class="n">flags</span> <span class="o">=</span> <span class="n">Flags</span><span class="o">.</span><span class="n">Design</span><span class="p">)</span>
 116
 117         <span class="n">txqueuelen</span> <span class="o">=</span> <span class="n">Attribute</span><span class="p">(</span><span class="s">&quot;txQueueLen&quot;</span><span class="p">,</span>
 118                 <span class="s">&quot;Specifies the interface&#39;s transmission queue length. &quot;</span>
 119                 <span class="s">&quot;Defaults to 1000. &quot;</span><span class="p">,</span>
 120                 <span class="nb">type</span> <span class="o">=</span> <span class="n">Types</span><span class="o">.</span><span class="n">Integer</span><span class="p">,</span>
 121                 <span class="n">flags</span> <span class="o">=</span> <span class="n">Flags</span><span class="o">.</span><span class="n">Design</span><span class="p">)</span>
 122
 123         <span class="n">bwlimit</span> <span class="o">=</span> <span class="n">Attribute</span><span class="p">(</span><span class="s">&quot;bwLimit&quot;</span><span class="p">,</span>
 124                 <span class="s">&quot;Specifies the interface&#39;s emulated bandwidth in bytes &quot;</span>
 125                 <span class="s">&quot;per second.&quot;</span><span class="p">,</span>
 126                 <span class="nb">type</span> <span class="o">=</span> <span class="n">Types</span><span class="o">.</span><span class="n">Integer</span><span class="p">,</span>
 127                 <span class="n">flags</span> <span class="o">=</span> <span class="n">Flags</span><span class="o">.</span><span class="n">Design</span><span class="p">)</span>
 128
 129         <span class="n">cls</span><span class="o">.</span><span class="n">_register_attribute</span><span class="p">(</span><span class="n">cipher</span><span class="p">)</span>
 130         <span class="n">cls</span><span class="o">.</span><span class="n">_register_attribute</span><span class="p">(</span><span class="n">cipher_key</span><span class="p">)</span>
 131         <span class="n">cls</span><span class="o">.</span><span class="n">_register_attribute</span><span class="p">(</span><span class="n">txqueuelen</span><span class="p">)</span>
 132         <span class="n">cls</span><span class="o">.</span><span class="n">_register_attribute</span><span class="p">(</span><span class="n">bwlimit</span><span class="p">)</span>
 133
 134     <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>
 135         <span class="nb">super</span><span class="p">(</span><span class="n">LinuxUdpTunnel</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>
 136         <span class="bp">self</span><span class="o">.</span><span class="n">_home</span> <span class="o">=</span> <span class="s">&quot;udp-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>
 137         <span class="bp">self</span><span class="o">.</span><span class="n">_pids</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">()</span>
 138
 139 <div class="viewcode-block" id="LinuxUdpTunnel.log_message"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.udptunnel.LinuxUdpTunnel.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>
 140         <span class="k">return</span> <span class="s">&quot; guid </span><span class="si">%d</span><span class="s"> - udptunnel </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>
 141                 <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>
 142                 <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>
 143                 <span class="n">msg</span><span class="p">)</span>
 144 </div>
 145 <div class="viewcode-block" id="LinuxUdpTunnel.get_endpoints"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.udptunnel.LinuxUdpTunnel.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>
 146         <span class="sd">&quot;&quot;&quot; Returns the list of RM that are endpoints to the tunnel </span>
 147 <span class="sd">        &quot;&quot;&quot;</span>
 148         <span class="n">connected</span> <span class="o">=</span> <span class="p">[]</span>
 149         <span class="k">for</span> <span class="n">guid</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">connections</span><span class="p">:</span>
 150             <span class="n">rm</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">ec</span><span class="o">.</span><span class="n">get_resource</span><span class="p">(</span><span class="n">guid</span><span class="p">)</span>
 151             <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">rm</span><span class="p">,</span> <span class="s">&quot;initiate_udp_connection&quot;</span><span class="p">):</span>
 152                 <span class="n">connected</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">rm</span><span class="p">)</span>
 153         <span class="k">return</span> <span class="n">connected</span>
 154 </div>
 155 <div class="viewcode-block" id="LinuxUdpTunnel.initiate_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.udptunnel.LinuxUdpTunnel.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>
 156         <span class="n">cipher</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;cipher&quot;</span><span class="p">)</span>
 157         <span class="n">cipher_key</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;cipherKey&quot;</span><span class="p">)</span>
 158         <span class="n">bwlimit</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;bwLimit&quot;</span><span class="p">)</span>
 159         <span class="n">txqueuelen</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;txQueueLen&quot;</span><span class="p">)</span>
 160         <span class="n">connection_app_home</span> <span class="o">=</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>
 161         <span class="n">connection_run_home</span> <span class="o">=</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>
 162
 163         <span class="n">port</span> <span class="o">=</span> <span class="n">endpoint</span><span class="o">.</span><span class="n">initiate_udp_connection</span><span class="p">(</span>
 164                 <span class="n">remote_endpoint</span><span class="p">,</span>
 165                 <span class="n">connection_app_home</span><span class="p">,</span>
 166                 <span class="n">connection_run_home</span><span class="p">,</span>
 167                 <span class="n">cipher</span><span class="p">,</span> <span class="n">cipher_key</span><span class="p">,</span> <span class="n">bwlimit</span><span class="p">,</span> <span class="n">txqueuelen</span><span class="p">)</span>
 168
 169         <span class="k">return</span> <span class="n">port</span>
 170 </div>
 171 <div class="viewcode-block" id="LinuxUdpTunnel.establish_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.udptunnel.LinuxUdpTunnel.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">port</span><span class="p">):</span>
 172         <span class="n">connection_app_home</span> <span class="o">=</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>
 173         <span class="n">connection_run_home</span> <span class="o">=</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>
 174
 175         <span class="n">endpoint</span><span class="o">.</span><span class="n">establish_udp_connection</span><span class="p">(</span><span class="n">remote_endpoint</span><span class="p">,</span>
 176                 <span class="n">connection_app_home</span><span class="p">,</span>
 177                 <span class="n">connection_run_home</span><span class="p">,</span>
 178                 <span class="n">port</span><span class="p">)</span>
 179 </div>
 180 <div class="viewcode-block" id="LinuxUdpTunnel.verify_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.udptunnel.LinuxUdpTunnel.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>
 181         <span class="n">connection_app_home</span> <span class="o">=</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>
 182         <span class="n">connection_run_home</span> <span class="o">=</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>
 183
 184         <span class="n">endpoint</span><span class="o">.</span><span class="n">verify_connection</span><span class="p">(</span><span class="n">remote_endpoint</span><span class="p">,</span>
 185                 <span class="n">connection_app_home</span><span class="p">,</span>
 186                 <span class="n">connection_run_home</span><span class="p">)</span>
 187 </div>
 188 <div class="viewcode-block" id="LinuxUdpTunnel.terminate_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.udptunnel.LinuxUdpTunnel.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>
 189         <span class="n">connection_app_home</span> <span class="o">=</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>
 190         <span class="n">connection_run_home</span> <span class="o">=</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>
 191
 192         <span class="n">endpoint</span><span class="o">.</span><span class="n">terminate_connection</span><span class="p">(</span><span class="n">remote_endpoint</span><span class="p">,</span>
 193                 <span class="n">connection_app_home</span><span class="p">,</span>
 194                 <span class="n">connection_run_home</span><span class="p">)</span>
 195 </div>
 196 <div class="viewcode-block" id="LinuxUdpTunnel.check_state_connection"><a class="viewcode-back" href="../../../../_layout/nepi.resources.linux.html#nepi.resources.linux.udptunnel.LinuxUdpTunnel.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>
 197         <span class="c"># Make sure the process is still running in background</span>
 198         <span class="c"># No execution errors occurred. Make sure the background</span>
 199         <span class="c"># process with the recorded pid is still running.</span>
 200
 201         <span class="n">status1</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="o">.</span><span class="n">check_status</span><span class="p">()</span>
 202         <span class="n">status2</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="o">.</span><span class="n">check_status</span><span class="p">()</span>
 203
 204         <span class="k">if</span> <span class="n">status1</span> <span class="o">==</span> <span class="n">ProcStatus</span><span class="o">.</span><span class="n">FINISHED</span> <span class="ow">and</span> \
 205                 <span class="n">status2</span> <span class="o">==</span> <span class="n">ProcStatus</span><span class="o">.</span><span class="n">FINISHED</span><span class="p">:</span>
 206
 207             <span class="c"># check if execution errors occurred</span>
 208             <span class="p">(</span><span class="n">out1</span><span class="p">,</span> <span class="n">err1</span><span class="p">),</span> <span class="n">proc1</span> <span class="o">=</span> <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">check_errors</span><span class="p">(</span>
 209                     <span class="bp">self</span><span class="o">.</span><span class="n">run_home</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint1</span><span class="p">))</span>
 210
 211             <span class="p">(</span><span class="n">out2</span><span class="p">,</span> <span class="n">err2</span><span class="p">),</span> <span class="n">proc2</span> <span class="o">=</span> <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">check_errors</span><span class="p">(</span>
 212                     <span class="bp">self</span><span class="o">.</span><span class="n">run_home</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">endpoint2</span><span class="p">))</span>
 213
 214             <span class="k">if</span> <span class="n">err1</span> <span class="ow">or</span> <span class="n">err2</span><span class="p">:</span>
 215                 <span class="n">msg</span> <span class="o">=</span> <span class="s">&quot;Error occurred in tunnel&quot;</span>
 216                 <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">err1</span><span class="p">,</span> <span class="n">err2</span><span class="p">)</span>
 217                 <span class="bp">self</span><span class="o">.</span><span class="n">fail</span><span class="p">()</span>
 218             <span class="k">else</span><span class="p">:</span>
 219                 <span class="bp">self</span><span class="o">.</span><span class="n">set_stopped</span><span class="p">()</span>
 220 </pre></div></div></div>
 221
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