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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3780/">https://reviewboard.asterisk.org/r/3780/</a>
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<a href="https://reviewboard.asterisk.org/r/3780/diff/7/?file=66217#file66217line935" style="color: black; font-weight: bold; text-decoration: underline;">/res/res_pjsip_outbound_publish.c</a>
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(Diff revision 7)
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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="tb"> </span><span class="cm">/* If nothing is being sent right now send the unpublish - the destroy will happen in the subsequent callback */</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="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">existing</span><span class="o">-></span><span class="n">state</span><span class="o">-></span><span class="n">sending</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; "></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="k">if</span> <span class="p">(</span><span class="n">ast_sip_push_task</span><span class="p">(</span><span class="nb">NULL</span><span class="p">,</span> <span class="n">send_unpublish_task</span><span class="p">,</span> <span class="n">ao2_bump</span><span class="p">(</span><span class="n">existing</span><span class="o">-></span><span class="n">state</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="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">"Could not send unpublish message on outbound publish '%s'</span><span class="se">\n</span><span class="s">"</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="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">ast_sorcery_object_get_id</span><span class="p">(</span><span class="n">existing</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="tb"> </span><span class="tb"> </span><span class="n">ao2_ref</span><span class="p">(</span><span class="n">existing</span><span class="o">-></span><span class="n">state</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; "><span class="tb"> </span><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; "><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; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">existing</span><span class="o">-></span><span class="n">state</span><span class="o">-></span><span class="n">destroy</span> <span class="o">=</span> <span class="mi">1</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;">This bit here is problematic. Consider the case that existing->state->sending is false. You push the task of sending the unpublish() to the threadpool. This gets queued behind a task (or multiple tasks, even) to service the publication queue. We service the publication queue and send out a publication. We receive the response for the publication. Since the 'destroy' field is set, we call pjsip_publishc_destroy() in the callback.
Eventually, the queued unpublish task executes. Problem is, we've destroyed the pjsip_publishc. When we attempt to call pjsip_publishc_send() to send the unpublish, there will be a crash since PJSIP will attempt to lock a destroyed mutex.
Somehow, you have to ensure that you don't call pjsip_publishc_destroy() in the callback until you know you are handling the response to the unpublish. You could have a reasonable guess at this by checking for the destroy flag in the callback and for checking if the response has an Expires: 0 header in it.</pre>
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<p>- Mark Michelson</p>
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<p>On August 5th, 2014, 5:37 p.m. UTC, Joshua Colp wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Joshua Colp.</div>
<p style="color: grey;"><i>Updated Aug. 5, 2014, 5:37 p.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 adds two PJSIP modules which add outbound PUBLISH support and an 'asterisk' event type.
The res_pjsip_outbound_publish module is a common module which provides basic logic for setting up outbound PUBLISH clients, handling authentication requests, handling configuration, and lifetime. Extra modules implement specific event types which are registered with res_pjsip_outbound_publish. Since it takes care of configuration when an outbound PUBLISH is configured extra configuration can be passed to the event type implementation to further configure itself.
The res_pjsip_publish_asterisk module implements inbound and outbound support for an 'asterisk' event type. This event type conveys device and mailbox state between Asterisk instances using a JSON content body. As internal device or mailbox state changes the module sends a PUBLISH message to other configured instances. When a PUBLISH is received the contents are examined and a device or mailbox state change queued up within Asterisk. To restrict what is sent and received filtering is available using regular expressions which can reduce SIP traffic.
A wiki page is available at https://wiki.asterisk.org/wiki/display/~jcolp/Exchanging+Device+and+Mailbox+State+Using+PJSIP which has some configuration details with some examples. This should also be reviewed.</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;">Set up two Asterisk instances, configured both sides to publish to eachother, made calls and manipulated voicemail. Watched PUBLISH messages go between them and state change.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/res/res_pjsip_pubsub.exports.in <span style="color: grey">(420047)</span></li>
<li>/trunk/res/res_pjsip_pubsub.c <span style="color: grey">(420047)</span></li>
<li>/trunk/res/res_pjsip_publish_asterisk.c <span style="color: grey">(PRE-CREATION)</span></li>
<li>/trunk/res/res_pjsip_outbound_publish.exports.in <span style="color: grey">(PRE-CREATION)</span></li>
<li>/trunk/res/res_pjsip_outbound_publish.c <span style="color: grey">(PRE-CREATION)</span></li>
<li>/trunk/include/asterisk/res_pjsip_pubsub.h <span style="color: grey">(420047)</span></li>
<li>/trunk/include/asterisk/res_pjsip_outbound_publish.h <span style="color: grey">(PRE-CREATION)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3780/diff/" style="margin-left: 3em;">View Diff</a></p>
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