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<p style="margin-top: 0;">On December 17th, 2010, 9:51 a.m., <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1059/diff/2/?file=14712#file14712line4964" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.4/channels/chan_sip.c</a>
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(Diff revision 2)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void get_viabranch(char *via, char **sent_by, char **branch)</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="cm"> * VIA syntax. RFC 3261 section 6.40.5</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"> * Via = ( "Via" | "v") ":" 1#( sent-protocol sent-by *( ";" via-params ) [ comment ] )</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"> * via-params = via-hidden | via-ttl | via-maddr | via-received | via-branch</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"> * via-hidden = "hidden"</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"> * via-ttl = "ttl" "=" ttl</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"> * via-maddr = "maddr" "=" maddr</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"> * via-received = "received" "=" host</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"> * via-branch = "branch" "=" token</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"> * sent-protocol = protocol-name "/" protocol-version "/" transport</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"> * protocol-name = "SIP" | token</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"> * protocol-version = token</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"> * transport = "UDP" | "TCP" | token</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"> * sent-by = ( host [ ":" port ] ) | ( concealed-host )</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"> * concealed-host = token</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"> * ttl = 1*3DIGIT ; 0 to 255<span class="ew"> </span></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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<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 is the RFC 2543 grammar for Via headers. RFC 3261 defines its grammar in section 25.1. Though the processing below is no different due to the limited scope of the parsing, it would make sense to have the proper grammar 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;">Done.</pre>
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<p style="margin-top: 0;">On December 17th, 2010, 9:51 a.m., <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1059/diff/2/?file=14712#file14712line4982" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.4/channels/chan_sip.c</a>
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(Diff revision 2)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void get_viabranch(char *via, char **sent_by, char **branch)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* chop off ("Via:" | "v:") if present */</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">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strncasecmp</span><span class="p">(</span><span class="n">via</span><span class="p">,</span> <span class="s">"Via:"</span><span class="p">,</span> <span class="mi">4</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="n">via</span> <span class="o">+=</span> <span class="mi">4</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="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strncasecmp</span><span class="p">(</span><span class="n">via</span><span class="p">,</span> <span class="s">"v:"</span><span class="p">,</span> <span class="mi">2</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="n">via</span> <span class="o">+=</span> <span class="mi">2</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="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 part is not necessary since get_header() returns the portion after "Via:" or "v:"</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;">Done.</pre>
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<p style="margin-top: 0;">On December 17th, 2010, 9:51 a.m., <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1059/diff/2/?file=14712#file14712line4992" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.4/channels/chan_sip.c</a>
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(Diff revision 2)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void get_viabranch(char *via, char **sent_by, char **branch)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* chop off sent-protocol */</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">via</span> <span class="o">=</span> <span class="n">ast_skip_blanks</span><span class="p">(</span><span class="n">via</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;">Similarly, this is done in get_header already.</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;">Done.</pre>
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<p style="margin-top: 0;">On December 17th, 2010, 9:51 a.m., <b>Mark Michelson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1059/diff/2/?file=14712#file14712line4998" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.4/channels/chan_sip.c</a>
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(Diff revision 2)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void get_viabranch(char *via, char **sent_by, char **branch)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* chop off sent-by */</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">via</span> <span class="o">=</span> <span class="n">ast_skip_blanks</span><span class="p">(</span><span class="n">via</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 shouldn't be necessary since strsep() will return the position past the end of a sequence of the tokens you pass to it.
To give an example, if you have a string str set to "Mark,,',,''',is cool" and call strsep(&str, ",'") once then you'll be returned a pointer to the 'i' in "is cool"</pre>
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<p>On December 17th, 2010, 10:02 a.m., <b>Matthew Nicholson</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;">Ok, I'll make these adjustments. These changes probably need to be made in the other branches that use this function too.</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;">This is necessary, strsep returns a pointer to the second ',' in that string. In other words, it returns a pointer to after the first matched token.</pre>
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<p>- Matthew</p>
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<p>On December 17th, 2010, 9:27 a.m., Matthew Nicholson wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Matthew Nicholson.</div>
<p style="color: grey;"><i>Updated 2010-12-17 09:27:27</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;">This patch makes asterisk respect the Via headers in a request when responding to it. This is necessary in the even that a stateless proxy is in between asterisk and the requester. Without this patch, the response is simply routed back to the address we received the initial request from (unless nat=yes is set).</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;">Briefly tested using openser as a stateless proxy and another asterisk machine as the requester. I sent and invite, then some INFO DTMF messages. Without the patch, our asterisk machine sends all responses to the INFO requests to the proxy, with the patch they are properly routed to the requesting asterisk machine. I also briefly tested with openser configured to use the Record-Route header as a stateful proxy.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/1.4/channels/chan_sip.c <span style="color: grey">(294163)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1059/diff/" style="margin-left: 3em;">View Diff</a></p>
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