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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2266/">https://reviewboard.asterisk.org/r/2266/</a>
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<p style="margin-top: 0;">On January 7th, 2013, 8:51 p.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2266/diff/1/?file=32634#file32634line6983" style="color: black; font-weight: bold; text-decoration: underline;">/main/channel.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; ">int ast_do_masquerade(struct ast_channel *original)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_manager_event_multichan</span><span class="p">(</span><span class="n">EVENT_FLAG_CALL</span><span class="p">,</span> <span class="s">"Masquerade"</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="n">chans</span><span class="p">,</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_manager_event_multichan</span><span class="p">(</span><span class="n">EVENT_FLAG_CALL</span><span class="p">,</span> <span class="s">"Masquerade"</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="n">chans</span><span class="p">,</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"Clone: %s</span><span class="se">\r\n</span><span class="s">"</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"Clone: %s</span><span class="se">\r\n</span><span class="s">"</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"CloneUniqueid: %s</span><span class="se">\r\n</span><span class="s">"</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"CloneState: %s</span><span class="se">\r\n</span><span class="s">"</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"CloneState: %s</span><span class="se">\r\n</span><span class="s">"</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"Original: %s</span><span class="se">\r\n</span><span class="s">"</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"Original: %s</span><span class="se">\r\n</span><span class="s">"</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="s">"OriginalUniqueid: %s</span><span class="se">\r\n</span><span class="s">"</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"OriginalState: %s</span><span class="se">\r\n</span><span class="s">"</span><span class="p">,</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="s">"OriginalState: %s</span><span class="se">\r\n</span><span class="s">"</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;">You should update the event XML documentation above for the Uniqueid headers.</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;">Good catch.</pre>
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<p style="margin-top: 0;">On January 7th, 2013, 8:51 p.m., <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/2266/diff/1/?file=32634#file32634line7012" style="color: black; font-weight: bold; text-decoration: underline;">/main/channel.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; ">int ast_do_masquerade(struct ast_channel *original)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Save the new name */</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Save the new name */</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_copy_string</span><span class="p">(</span><span class="n">newn</span><span class="p">,</span> <span class="n">ast_channel_name</span><span class="p">(</span><span class="n">clonechan</span><span class="p">),</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">newn</span><span class="p">));</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_copy_string</span><span class="p">(</span><span class="n">newn</span><span class="p">,</span> <span class="n">ast_channel_name</span><span class="p">(</span><span class="n">clonechan</span><span class="p">),</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">newn</span><span class="p">));</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Create the <span class="hl">masq</span> name */</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Create the <span class="hl">zombie</span> name */</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">snprintf</span><span class="p">(</span><span class="n">masqn</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">masqn</span><span class="p">),</span> <span class="s">"%s<MASQ>"</span><span class="p">,</span> <span class="n">newn</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">snprintf</span><span class="p">(</span><span class="n">zombn</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">zombn</span><span class="p">),</span> <span class="s">"%s<ZOMBIE>"</span><span class="p">,</span> <span class="n">ast_channel_name</span><span class="p">(</span><span class="n">original</span><span class="p">));</span> <span class="cm">/* quick, hide the brains! */</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Mangle the name of the clone channel */</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">__ast_change_name_nolink</span><span class="p">(</span><span class="n">clonechan</span><span class="p">,</span> <span class="n">masqn</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Copy the name from the clone channel */</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">__ast_change_name_nolink</span><span class="p">(</span><span class="n">original</span><span class="p">,</span> <span class="n">newn</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * Shuffle names around on the channels, and do so in such a way that we only send</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"> * one rename event: original -> original<ZOMBIE>. The other renames are implementation</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"> * details of the masquerade, and shouldn't generate events.</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></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_name_set</span><span class="p">(</span><span class="n">clonechan</span><span class="p">,</span> <span class="n">ast_channel_name</span><span class="p">(</span><span class="n">original</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="n">__ast_change_name_nolink</span><span class="p">(</span><span class="n">clonechan</span><span class="p">,</span> <span class="n">zombn</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="n">ast_channel_name_set</span><span class="p">(</span><span class="n">original</span><span class="p">,</span> <span class="n">newn</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;">You can eliminate one of these name arrays (Preferably newn[]) with some more judicious shuffling of strings.
Do this as one block of code lines:
1) Swap channel names
2) Rename origclone channel name to zombie.</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;">Maybe I'm being a bit dense, but wouldn't swapping the channel name require a temporary? How is that any different than what's going on with newn?
Although I do think I can make the shuffling a bit clearer.</pre>
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<p>- David</p>
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<p>On January 7th, 2013, 2:04 p.m., David Lee wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By David Lee.</div>
<p style="color: grey;"><i>Updated Jan. 7, 2013, 2:04 p.m.</i></p>
<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;">Masquerades are an insane implementation detail within Asterisk. It generates
a number of useless and confusing events, and manipulates channels in a way
that semantically doesn't make sense. I've given a fairly thorough review of
masquerade code and its usage on the wiki at
https://wiki.asterisk.org/wiki/x/IwBRAQ.
While ultimately it makes the most sense to abandon masquerades altogether,
it will take some time to completely irradicate. Even then, there may always
be code that's not worth rewriting to get rid of the masquerade.
This patch does two things to make masquerades slightly less insane:
* When swapping the names of the original and clone channel, only emit a
single rename event of original -> original<ZOMBIE>. The original code
issued three rename events to accomplish the same end.
* In addition to swapping the names of the channels, also swap their
uniqueid's. This allows the 'Uniqueid' field to be used as a stable
identifier for a channel from and external interface, such as AMI.</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've run a few SIP transfers and parking scenarios. AMI masquerade events seem
reasonable, and the Uniqueid and Linkedid fields in CELs made more sense.</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/UPGRADE.txt <span style="color: grey">(378651)</span></li>
<li>/trunk/include/asterisk/manager.h <span style="color: grey">(378651)</span></li>
<li>/trunk/main/channel.c <span style="color: grey">(378651)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2266/diff/" style="margin-left: 3em;">View Diff</a></p>
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