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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2543/">https://reviewboard.asterisk.org/r/2543/</a>
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<p style="margin-top: 0;">On May 16th, 2013, 9:43 p.m. UTC, <b>Mark Michelson</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">In general, there is a huge lack of logging in this review (one count of ast_log that I could find). Transfers are always destined to be the place where bugs will occur most. Therefore, this should be absolutely riddled with log messages. Way more than you think you should need. We'll be glad they're there once people start reporting transfer bugs.</pre>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I've added lots of debug messages, and some error/warning messages.</pre>
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<p style="margin-top: 0;">On May 16th, 2013, 9:43 p.m. UTC, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37944#file37944line856" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/channels/chan_gulp.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="n">pjsip_msg_add_hdr</span><span class="p">(</span><span class="n">packet</span><span class="o">-></span><span class="n">msg</span><span class="p">,</span> <span class="p">(</span><span class="n">pjsip_hdr</span> <span class="o">*</span><span class="p">)</span> <span class="n">contact</span><span class="p">);</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Did you ever run any tests where you called the Ringing() application and then the Transfer() application?
I suspect that if you did that, you might end up with a case where you end up sending a 302 with two Contact headers. The reason is that pjsip_inv_end_session() will reuse the latest request/response that was sent. If the previous response sent had a Contact header, then I suspect that adding a new one will just tack on a second one.
I suggest erasing any Contact header already present in the packet before adding the new Contact header to the response.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Instead of removing it I just overwrite the URI portion if present, this saves a bit of memory.</pre>
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<p style="margin-top: 0;">On May 16th, 2013, 9:43 p.m. UTC, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line110" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.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="cm">/* If the subscription is being terminated we want to actually remove the progress structure here to</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * stop a deadlock from occurring - basically terminated changes the state which queues a synchronous task</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * but we are already running a task... thus it would deadlock */</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">notification</span><span class="o">-></span><span class="n">state</span> <span class="o">==</span> <span class="n">PJSIP_EVSUB_STATE_TERMINATED</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This has some flaws. notification->state is the state of the subscription when this task was queued, not the actual current state. So just because notification->state is not TERMINATED, it doesn't guarantee that the synchronous task from the state change callback isn't currently running. Thus the deadlock can still occur.
Second, the deadlock described isn't necessarily going to occur even if the TERMINATED state is accurately detected because this callback can run in either the refer_progress's serializer or a session's serializer.
So let's think through this a bit.
Right now, a refer_progress gets its own serializer allocated. This is used for sending progress notifications and for setting the progress's subscription NULL when the subscription is terminated.
Well, consider this. What if the refer_progress just used a reference to the session serializer from the session on which the REFER was received? The progress notifications are sent in the same dialog, so it makes sense to do this.
This way, the evsub state change to TERMINATED will happen in one of two cases
1) An incoming BYE terminates the subscription
2) The REFER subscription times out
In case 1) The evsub state change callback will run in the session serializer. Since this is the same serializer where event notifications are sent, you won't have to push a synchronous task to set the progress->sub NULL. You can just set it in place.
For case 2, I think you could just push an asynchronous task that does everything that your state change callback does now, to include setting progress->sub NULL.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">SO! A dialog serializer is tied to a session and INVITE session, when the INVITE session is disconnected the dialog serializer is removed and is no longer enforced. Changing this becomes complicated with managing the lifetime of that serializer. That's why I took the approach of using a serializer just for this. This ensures that the evsub pointer, when present, remains valid. How? When the evsub is terminated (and the evsub presumably going to be destroyed) a synchronous task is queued which sets the evsub pointer to NULL. Before doing this the dialog lock is released so other pushed tasks *can* invoke evsub operations. The evsub structure is guaranteed to be valid. Once the synchronous task is complete (and evsub pointer set to NULL) any further tasks will not act on the evsub and stuff finishes.</pre>
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<p style="margin-top: 0;">On May 16th, 2013, 9:43 p.m. UTC, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line250" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.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">refer_sub</span> <span class="o">&&</span> <span class="n">pj_strnicmp2</span><span class="p">(</span><span class="o">&</span><span class="n">refer_sub</span><span class="o">-></span><span class="n">hvalue</span><span class="p">,</span> <span class="s">"true"</span><span class="p">,</span> <span class="mi">4</span><span class="p">))</span> <span class="o">||</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="o">!</span><span class="p">(</span><span class="n">progress</span> <span class="o">=</span> <span class="n">ao2_alloc</span><span class="p">(</span><span class="k">sizeof</span><span class="p">(</span><span class="o">*</span><span class="n">progress</span><span class="p">),</span> <span class="n">refer_progress_destroy</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="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This return point causes a return value of NULL to be ambiguous.
Callers of refer_progress_alloc() assume that a NULL return means that progress was not requested (i.e. no error), but it can also indicate that a failure occurred when attempting to allocate the progress structure (i.e. an error).</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I erred on this on purpose to give a better chance for the requested action (transfer) to be completed successfully, despite the inability to allocate some memory and monitor its progress. I'm fine with changing this to fail if you think so.</pre>
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<p style="margin-top: 0;">On May 16th, 2013, 9:43 p.m. UTC, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line260" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.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="o">!</span><span class="p">(</span><span class="n">progress</span><span class="o">-></span><span class="n">serializer</span> <span class="o">=</span> <span class="n">ast_sip_create_serializer</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="n">progress</span><span class="p">;</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Since these messages are sent in the session's dialog, why not use the session's serializer?</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">See previous comments.</pre>
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<p style="margin-top: 0;">On May 16th, 2013, 9:43 p.m. UTC, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line298" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.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="cm">/*! \brief Transferee session */</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">ast_sip_session</span> <span class="o">*</span><span class="n">transferee</span><span class="p">;</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This use of "transferee" is non-standard and liable to cause confusion. This session is actually also the transferer, but it is bridged with the transfer target rather than the transferee.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Can you suggest an alternate?</pre>
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<p style="margin-top: 0;">On May 16th, 2013, 9:43 p.m. UTC, <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line629" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.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="tb"> </span><span class="cm">/* This will use a synchronous task but we aren't operating in the serializer at this point in time, so it</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span> * won't deadlock */</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">ast_channel_move</span><span class="p">(</span><span class="n">invite</span><span class="p">.</span><span class="n">channel</span><span class="p">,</span> <span class="n">session</span><span class="o">-></span><span class="n">channel</span><span class="p">);</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This comment seems out of place since it isn't by a synchronous task and we are operating in the session's serializer here.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Since this is a new session it isn't yet sent to the session serializer (hrm, should we make the code do that?)</pre>
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<p>- Joshua</p>
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<p>On May 15th, 2013, 6:32 p.m. UTC, Joshua Colp wrote:</p>
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<div>Review request for Asterisk Developers and Mark Michelson.</div>
<div>By Joshua Colp.</div>
<p style="color: grey;"><i>Updated May 15, 2013, 6:32 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;">These changes add support for the following:
1. Blind transfers originating from a remote device
2. Blind transfers originated to a remote device
3. Redirection originated to a remote device (before session has been answered)
4. Attended transfers originating from a remote device when both legs are local
5. Attended transfers originating from a remote device when only one leg is local (additional dialplan logic required)
6. Replacement of a session using INVITE with replaces
7. Transfer progress notification using a frame hook
8. norefersub support
* This patch relies on pimp my SIP, bridge_construction, and more_transfer.</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;">Testing the various scenarios using SIPP and phones.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/team/group/bridge_construction/res/res_sip_refer.c <span style="color: grey">(PRE-CREATION)</span></li>
<li>/team/group/bridge_construction/include/asterisk/res_sip_session.h <span style="color: grey">(388524)</span></li>
<li>/team/group/bridge_construction/channels/chan_gulp.c <span style="color: grey">(388524)</span></li>
<li>/team/group/bridge_construction/res/res_sip_session.c <span style="color: grey">(388524)</span></li>
<li>/team/group/bridge_construction/res/res_sip_session.exports.in <span style="color: grey">(388524)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2543/diff/" style="margin-left: 3em;">View Diff</a></p>
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