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This is an automatically generated e-mail. To reply, visit:
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<a href="https://reviewboard.asterisk.org/r/4155/diff/2/?file=68951#file68951line74" style="color: black; font-weight: bold; text-decoration: underline;">branches/12/res/res_pjsip_nat.c</a>
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(Diff revision 2)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm">/*! \brief Remove mappings related to this transport */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">void</span> <span class="nf">state_listener_cb</span><span class="p">(</span><span class="n">pjsip_transport</span> <span class="o">*</span><span class="n">tp</span><span class="p">,</span> <span class="n">pjsip_transport_state</span> <span class="n">state</span><span class="p">,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">const</span> <span class="n">pjsip_transport_state_info</span> <span class="o">*</span><span class="n">info</span><span class="p">)</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">struct</span> <span class="n">transport_mapping</span> <span class="o">*</span><span class="n">tp_mapping</span> <span class="o">=</span> <span class="n">info</span><span class="o">-></span><span class="n">user_data</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">struct</span> <span class="n">pjsip_dialog</span> <span class="o">*</span><span class="n">dlg</span> <span class="o">=</span> <span class="n">tp_mapping</span><span class="o">-></span><span class="n">dlg</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">state</span> <span class="o">!=</span> <span class="n">PJSIP_TP_STATE_DISCONNECTED</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">return</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="cm">/* adjust dialog target information */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">dlg</span><span class="o">-></span><span class="n">remote</span><span class="p">.</span><span class="n">contact</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">dlg</span><span class="o">-></span><span class="n">remote</span><span class="p">.</span><span class="n">contact</span><span class="o">-></span><span class="n">uri</span> <span class="o">=</span> <span class="n">tp_mapping</span><span class="o">-></span><span class="n">orig_uri</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">dlg</span><span class="o">-></span><span class="n">target</span> <span class="o">=</span> <span class="n">tp_mapping</span><span class="o">-></span><span class="n">orig_uri</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="cm">/* destroy mapping */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">pjsip_dlg_set_mod_data</span><span class="p">(</span><span class="n">dlg</span><span class="p">,</span> <span class="n">nat_module</span><span class="p">.</span><span class="n">id</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">destroy_mapping</span><span class="p">(</span><span class="n">tp_mapping</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Is there a potential race condition here between transport termination and dialog termination where either may point to invalid memory?</pre>
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<p>- Joshua Colp</p>
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<p>On November 13th, 2014, 4:53 p.m. UTC, opticron wrote:</p>
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<div>Review request for Asterisk Developers and Joshua Colp.</div>
<div>By opticron.</div>
<p style="color: grey;"><i>Updated Nov. 13, 2014, 4:53 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-24486">ASTERISK-24486</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This modifies contact rewriting to revert to the original contact URI for a dialog when persistent transports shut down.
Some calls can enter a condition where their contact URI from the initial incoming invite was rewritten for a reliable transport, but that transport has been shut down due to inactivity. Such reliable transports can not be re-established since the remote host was never listening on the associated port. In cases such as these, it is useful to be able to fall back to the original contact URI since it might be accessible and allow the call to continue normally.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Verified that this allowed the call to operate normally despite the original reliable connection being torn down where this situation was experienced.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>branches/12/res/res_pjsip_nat.c <span style="color: grey">(427735)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/4155/diff/" style="margin-left: 3em;">View Diff</a></p>
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