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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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<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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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37944#file37944line848" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/channels/chan_gulp.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; "></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">pj_strdup2</span><span class="p">(</span><span class="n">packet</span><span class="o">-></span><span class="n">pool</span><span class="p">,</span> <span class="o">&</span><span class="n">tmp</span><span class="p">,</span> <span class="n">target</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="k">if</span> <span class="p">(</span><span class="o">!</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">pjsip_parse_uri</span><span class="p">(</span><span class="n">packet</span><span class="o">-></span><span class="n">pool</span><span class="p">,</span> <span class="n">tmp</span><span class="p">.</span><span class="n">ptr</span><span class="p">,</span> <span class="n">tmp</span><span class="p">.</span><span class="n">slen</span><span class="p">,</span> <span class="n">PJSIP_PARSE_URI_AS_NAMEADDR</span><span class="p">)))</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;">PJSIP documentation stipulates that the string passed into pjsip_parse_uri() MUST be null-terminated. So use pj_strdup2_with_null() instead of pj_strdup2().</pre>
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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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(Diff revision 2)
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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="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;">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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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37944#file37944line1160" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/channels/chan_gulp.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int hangup(void *data)</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">1037</font></th>
<td bgcolor="#fdfebc" 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">status</span> <span class="o">=</span> <span class="n">pjsip_inv_end_session</span><span class="p">(</span><span class="n">session</span><span class="o">-></span><span class="n">inv_session</span><span class="p">,</span> <span class="n">cause</span> <span class="o">?</span> <span class="n">cause</span> <span class="o">:</span> <span class="mi">603</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="o">&</span><span class="n">packet</span><span class="p">))</span> <span class="o">==</span> <span class="n">PJ_SUCCESS</span><span class="p">)</span> <span class="o">&&</span> <span class="n">packet</span><span class="p">)</span> <span class="p">{</span></pre></td>
<th bgcolor="#e9eaa8" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1160</font></th>
<td bgcolor="#fdfebc" 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="n">session</span><span class="o">-></span><span class="n">defer_terminate</span> <span class="o">&&</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">1161</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><span class="n">status</span> <span class="o">=</span> <span class="n">pjsip_inv_end_session</span><span class="p">(</span><span class="n">session</span><span class="o">-></span><span class="n">inv_session</span><span class="p">,</span> <span class="n">cause</span> <span class="o">?</span> <span class="n">cause</span> <span class="o">:</span> <span class="mi">603</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="o">&</span><span class="n">packet</span><span class="p">))</span> <span class="o">==</span> <span class="n">PJ_SUCCESS</span><span class="p">)</span> <span class="o">&&</span> <span class="n">packet</span><span class="p">)</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;">So here's a painful case.
What happens if we are communicating with a buggy client that does not send us a BYE when a transfer completes?
I'm pretty sure that PJSIP will eventually time out the implicit REFER subscription (based on some default timeout), but will the INVITE dialog ever terminate? I know that if session timers are enabled, it will, but what if session timers aren't enabled?</pre>
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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="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 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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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line188" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.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="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">notification</span><span class="p">)</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">189</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">ast_sip_push_task</span><span class="p">(</span><span class="n">progress</span><span class="o">-></span><span class="n">serializer</span><span class="p">,</span> <span class="n">refer_progress_notify</span><span class="p">,</span> <span class="n">notification</span><span class="p">))</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">190</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_cleanup</span><span class="p">(</span><span class="n">notification</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">191</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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<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;">Combine these two ifs with &&</pre>
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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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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">252</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">return</span> <span class="nb">NULL</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">253</font></th>
<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;">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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<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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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">260</font></th>
<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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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">261</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">return</span> <span class="n">progress</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">262</font></th>
<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;">Since these messages are sent in the session's dialog, why not use the session's serializer?</pre>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line275" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.c</a>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">275</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">const</span> <span class="kt">pj_str_t</span> <span class="n">str_true</span> <span class="o">=</span> <span class="p">{</span> <span class="s">"true"</span><span class="p">,</span> <span class="mi">4</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;">May as well define this string at the top of the function and replace the previous pj_strnicmp2 with a call to pj_strnicmp using this constant string.</pre>
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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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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">299</font></th>
<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="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 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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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line386" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.c</a>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">386</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm">/*! \brief Blind transfer callback function */</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">refer_blind_callback</span><span class="p">(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</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;">Just a word of warning: Due to review feedback in an open review of mine, this callback will have an extra parameter to it which tells if the transfer is single-party or multi-party.</pre>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line494" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.c</a>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">494</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="o">!</span><span class="n">ast_exists_extension</span><span class="p">(</span><span class="nb">NULL</span><span class="p">,</span> <span class="n">context</span><span class="p">,</span> <span class="s">"external_replaces"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">))</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">495</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">return</span> <span class="mi">404</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">496</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;">+1 to sending remote attended transfers to a common extension.</pre>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line545" 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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">545</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">case</span> <span class="n">AST_BRIDGE_TRANSFER_INVALID</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">546</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">return</span> <span class="mi">503</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;">I think the INVALID case should get a 400 response instead of a 500. They tried an invalid operation.</pre>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line545" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.c</a>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">545</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">case</span> <span class="n">AST_BRIDGE_TRANSFER_INVALID</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">546</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">return</span> <span class="mi">503</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">547</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">case</span> <span class="n">AST_BRIDGE_TRANSFER_NOT_PERMITTED</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">548</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">return</span> <span class="mi">403</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">549</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">case</span> <span class="n">AST_BRIDGE_TRANSFER_FAIL</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">550</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">return</span> <span class="mi">500</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">551</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">case</span> <span class="n">AST_BRIDGE_TRANSFER_SUCCESS</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">552</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">session</span><span class="o">-></span><span class="n">defer_terminate</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="k">return</span> <span class="mi">200</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 say to align the case statements with the switch.
i.e.
switch(foo) {
case bar:
do_stuff();
break;
case baz:
do_different_stuff();
break;
}
This is done other places in this review as well.</pre>
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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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(Diff revision 2)
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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="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 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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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line632" style="color: black; font-weight: bold; text-decoration: underline;">/team/group/bridge_construction/res/res_sip_refer.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="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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<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_hangup</span><span class="p">(</span><span class="n">chan</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> <span class="k">else</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">ast_bridge_impart</span><span class="p">(</span><span class="n">invite</span><span class="p">.</span><span class="n">bridge</span><span class="p">,</span> <span class="n">session</span><span class="o">-></span><span class="n">channel</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="nb">NULL</span><span class="p">,</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;">ast_channel_move() and ast_bridge_impart() can fail.</pre>
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<a href="https://reviewboard.asterisk.org/r/2543/diff/2/?file=37946#file37946line747" 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="p">(</span><span class="n">ast_channel_state</span><span class="p">(</span><span class="n">session</span><span class="o">-></span><span class="n">channel</span><span class="p">)</span> <span class="o">!=</span> <span class="n">AST_STATE_DOWN</span><span class="p">)</span> <span class="o">||</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;">Rather than using channel state here, I'd suggest using session->inv_session->state. Only add the Replaces on PJSIP_INV_STATE_CALLING.
This way, you won't add Replaces headers on reinvites that we send.</pre>
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<p>- Mark</p>
<br />
<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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