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<h2 class="heading"><span>Determine The Exit You're Using</span></h2>
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<div class="section" id="determine-the-exit-you-re-using">
<h1>Determine The Exit You're Using<a class="headerlink" href="#determine-the-exit-you-re-using" title="Permalink to this headline">ΒΆ</a></h1>
<a class="reference external image-reference" href="../double_double_toil_and_trouble.html"><img alt="../../_images/back.png" src="../../_images/back.png" /></a>
<p>Lets say you're using Tor and one day you run into something odd. Maybe a
misconfigured relay, or maybe one that's being malicious. How can you figure
out what exit you're using?</p>
<p>Here's a simple script that prints information about the exits used to service
the requests going through Tor...</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">functools</span>
<span class="kn">from</span> <span class="nn">stem</span> <span class="kn">import</span> <span class="n">StreamStatus</span>
<span class="kn">from</span> <span class="nn">stem.control</span> <span class="kn">import</span> <span class="n">EventType</span><span class="p">,</span> <span class="n">Controller</span>
<span class="k">def</span> <span class="nf">main</span><span class="p">():</span>
<span class="k">print</span><span class="p">(</span><span class="s">"Tracking requests for tor exits. Press 'enter' to end."</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">""</span><span class="p">)</span>
<span class="k">with</span> <span class="n">Controller</span><span class="o">.</span><span class="n">from_port</span><span class="p">()</span> <span class="k">as</span> <span class="n">controller</span><span class="p">:</span>
<span class="n">controller</span><span class="o">.</span><span class="n">authenticate</span><span class="p">()</span>
<span class="n">stream_listener</span> <span class="o">=</span> <span class="n">functools</span><span class="o">.</span><span class="n">partial</span><span class="p">(</span><span class="n">stream_event</span><span class="p">,</span> <span class="n">controller</span><span class="p">)</span>
<span class="n">controller</span><span class="o">.</span><span class="n">add_event_listener</span><span class="p">(</span><span class="n">stream_listener</span><span class="p">,</span> <span class="n">EventType</span><span class="o">.</span><span class="n">STREAM</span><span class="p">)</span>
<span class="nb">raw_input</span><span class="p">()</span> <span class="c"># wait for user to press enter</span>
<span class="k">def</span> <span class="nf">stream_event</span><span class="p">(</span><span class="n">controller</span><span class="p">,</span> <span class="n">event</span><span class="p">):</span>
<span class="k">if</span> <span class="n">event</span><span class="o">.</span><span class="n">status</span> <span class="o">==</span> <span class="n">StreamStatus</span><span class="o">.</span><span class="n">SUCCEEDED</span> <span class="ow">and</span> <span class="n">event</span><span class="o">.</span><span class="n">circ_id</span><span class="p">:</span>
<span class="n">circ</span> <span class="o">=</span> <span class="n">controller</span><span class="o">.</span><span class="n">get_circuit</span><span class="p">(</span><span class="n">event</span><span class="o">.</span><span class="n">circ_id</span><span class="p">)</span>
<span class="n">exit_fingerprint</span> <span class="o">=</span> <span class="n">circ</span><span class="o">.</span><span class="n">path</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span>
<span class="n">exit_relay</span> <span class="o">=</span> <span class="n">controller</span><span class="o">.</span><span class="n">get_network_status</span><span class="p">(</span><span class="n">exit_fingerprint</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">"Exit relay for our connection to </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">event</span><span class="o">.</span><span class="n">target</span><span class="p">))</span>
<span class="k">print</span><span class="p">(</span><span class="s">" address: </span><span class="si">%s</span><span class="s">:</span><span class="si">%i</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">exit_relay</span><span class="o">.</span><span class="n">address</span><span class="p">,</span> <span class="n">exit_relay</span><span class="o">.</span><span class="n">or_port</span><span class="p">))</span>
<span class="k">print</span><span class="p">(</span><span class="s">" fingerprint: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">exit_relay</span><span class="o">.</span><span class="n">fingerprint</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">" nickname: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">exit_relay</span><span class="o">.</span><span class="n">nickname</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="s">" locale: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">controller</span><span class="o">.</span><span class="n">get_info</span><span class="p">(</span><span class="s">"ip-to-country/</span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">exit_relay</span><span class="o">.</span><span class="n">address</span><span class="p">,</span> <span class="s">'unknown'</span><span class="p">))</span>
<span class="k">print</span><span class="p">(</span><span class="s">""</span><span class="p">)</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">'__main__'</span><span class="p">:</span>
<span class="n">main</span><span class="p">()</span>
</pre></div>
</div>
<p>Now if you make a request over Tor...</p>
<div class="highlight-python"><pre>% curl --socks4a 127.0.0.1:9050 google.com
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="http://www.google.com/">here</A>.
</BODY></HTML></pre>
</div>
<p>... this script will tell you about the exit...</p>
<div class="highlight-python"><pre>% python exit_used.py
Tracking requests for tor exits. Press 'enter' to end.
Exit relay for our connection to 64.15.112.44:80
address: 31.172.30.2:443
fingerprint: A59E1E7C7EAEE083D756EE1FF6EC31CA3D8651D7
nickname: chaoscomputerclub19
locale: unknown</pre>
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