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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3337/">https://reviewboard.asterisk.org/r/3337/</a>
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<a href="https://reviewboard.asterisk.org/r/3337/diff/1/?file=55803#file55803line1332" style="color: black; font-weight: bold; text-decoration: underline;">http://svn.asterisk.org/svn/asterisk/branches/11/res/res_rtp_asterisk.c</a>
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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">rtp</span> <span class="o">&&</span> <span class="n">rtp</span><span class="o">-></span><span class="n">ssl</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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<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;">Coding guidelines: Opening brace goes on the same line as the if.</pre>
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<a href="https://reviewboard.asterisk.org/r/3337/diff/1/?file=55803#file55803line1364" style="color: black; font-weight: bold; text-decoration: underline;">http://svn.asterisk.org/svn/asterisk/branches/11/res/res_rtp_asterisk.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void dtls_srtp_check_pending(struct ast_rtp_instance *instance, struct ast_rtp *rtp)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1364</font></th>
<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="cm">/* Stop existing DTLS timer if running */</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1365</font></th>
<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">if</span> <span class="p">(</span><span class="n">rtp</span><span class="o">-></span><span class="n">dtlstimerid</span> <span class="o">></span> <span class="o">-</span><span class="mi">1</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1366</font></th>
<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="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1367</font></th>
<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="tb"> </span><span class="n">AST_SCHED_DEL_UNREF</span><span class="p">(</span><span class="n">rtp</span><span class="o">-></span><span class="n">sched</span><span class="p">,</span> <span class="n">rtp</span><span class="o">-></span><span class="n">dtlstimerid</span><span class="p">,</span> <span class="n">ao2_ref</span><span class="p">(</span><span class="n">instance</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1368</font></th>
<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="tb"> </span><span class="n">rtp</span><span class="o">-></span><span class="n">dtlstimerid</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1369</font></th>
<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="p">}</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1370</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1371</font></th>
<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">if</span> <span class="p">(</span><span class="n">DTLSv1_get_timeout</span><span class="p">(</span><span class="n">rtp</span><span class="o">-></span><span class="n">ssl</span><span class="p">,</span> <span class="o">&</span><span class="n">dtls_timeout</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1372</font></th>
<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="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1373</font></th>
<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="tb"> </span><span class="kt">int</span> <span class="n">timeout</span> <span class="o">=</span> <span class="n">dtls_timeout</span><span class="p">.</span><span class="n">tv_sec</span> <span class="o">*</span> <span class="mi">1000</span> <span class="o">+</span> <span class="n">dtls_timeout</span><span class="p">.</span><span class="n">tv_usec</span><span class="o">/</span><span class="mi">1000</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1374</font></th>
<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="tb"> </span><span class="n">ao2_ref</span><span class="p">(</span><span class="n">instance</span><span class="p">,</span> <span class="o">+</span><span class="mi">1</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1375</font></th>
<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="tb"> </span><span class="k">if</span> <span class="p">((</span><span class="n">rtp</span><span class="o">-></span><span class="n">dtlstimerid</span> <span class="o">=</span> <span class="n">ast_sched_add</span><span class="p">(</span><span class="n">rtp</span><span class="o">-></span><span class="n">sched</span><span class="p">,</span> <span class="n">timeout</span><span class="p">,</span> <span class="n">dtls_srtp_handle_timeout</span><span class="p">,</span> <span class="n">instance</span><span class="p">))</span> <span class="o"><</span> <span class="mi">0</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1376</font></th>
<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="tb"> </span><span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></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="tb"> </span><span class="tb"> </span><span class="n">ao2_ref</span><span class="p">(</span><span class="n">instance</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1378</font></th>
<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="tb"> </span><span class="tb"> </span><span class="n">ast_log</span><span class="p">(</span><span class="n">LOG_WARNING</span><span class="p">,</span> <span class="s">"scheduling DTLS retransmission for RTP instance [%p] failed.</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">instance</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1379</font></th>
<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="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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1380</font></th>
<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="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;">There is a race condition here where multiple timeouts could be setup if the timer callback is running when dtls_srtp_check_pending is called from outside the timer callback.
When this happens, the AST_SCHED_DEL_UNREF attempt will instead have to use ast_sched_del to check for failure and abort rescheduling for one of the call paths (timer->dtls_srtp_check_pending or other_code->dtls_srtp_check_pending) since the other code path will need to go ahead with the rescheduling attempt.</pre>
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<a href="https://reviewboard.asterisk.org/r/3337/diff/1/?file=55803#file55803line1365" style="color: black; font-weight: bold; text-decoration: underline;">http://svn.asterisk.org/svn/asterisk/branches/11/res/res_rtp_asterisk.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void dtls_srtp_check_pending(struct ast_rtp_instance *instance, struct ast_rtp *rtp)</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">if</span> <span class="p">(</span><span class="n">rtp</span><span class="o">-></span><span class="n">dtlstimerid</span> <span class="o">></span> <span class="o">-</span><span class="mi">1</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; "></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="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;">Coding guidelines.</pre>
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<a href="https://reviewboard.asterisk.org/r/3337/diff/1/?file=55803#file55803line1371" style="color: black; font-weight: bold; text-decoration: underline;">http://svn.asterisk.org/svn/asterisk/branches/11/res/res_rtp_asterisk.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void dtls_srtp_check_pending(struct ast_rtp_instance *instance, struct ast_rtp *rtp)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1371</font></th>
<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">if</span> <span class="p">(</span><span class="n">DTLSv1_get_timeout</span><span class="p">(</span><span class="n">rtp</span><span class="o">-></span><span class="n">ssl</span><span class="p">,</span> <span class="o">&</span><span class="n">dtls_timeout</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="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;">Coding guidelines.</pre>
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<a href="https://reviewboard.asterisk.org/r/3337/diff/1/?file=55803#file55803line1375" style="color: black; font-weight: bold; text-decoration: underline;">http://svn.asterisk.org/svn/asterisk/branches/11/res/res_rtp_asterisk.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void dtls_srtp_check_pending(struct ast_rtp_instance *instance, struct ast_rtp *rtp)</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="tb"> </span><span class="k">if</span> <span class="p">((</span><span class="n">rtp</span><span class="o">-></span><span class="n">dtlstimerid</span> <span class="o">=</span> <span class="n">ast_sched_add</span><span class="p">(</span><span class="n">rtp</span><span class="o">-></span><span class="n">sched</span><span class="p">,</span> <span class="n">timeout</span><span class="p">,</span> <span class="n">dtls_srtp_handle_timeout</span><span class="p">,</span> <span class="n">instance</span><span class="p">))</span> <span class="o"><</span> <span class="mi">0</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="tb"> </span><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;">Coding guidelines.</pre>
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<p>- opticron</p>
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<p>On March 12th, 2014, 8:21 a.m. CDT, Nitesh Bansal wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Nitesh Bansal.</div>
<p style="color: grey;"><i>Updated March 12, 2014, 8:21 a.m.</i></p>
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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 patch adds the code to do the DTLS retransmissions in Asterisk.</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;">I tested this with a basic SIPP script, which fakes a DTLS INVITE.
Asterisk thinks that it is a DTLS call and inititates the DTLS handshake. SIPP doesn't respond to DTLS handshake, which causes the DTLS timeout and DTLS retransmission takes place.
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>http://svn.asterisk.org/svn/asterisk/branches/11/res/res_rtp_asterisk.c <span style="color: grey">(410469)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3337/diff/" style="margin-left: 3em;">View Diff</a></p>
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