forked from premiere/premiere-libtorrent
117 lines
4.3 KiB
HTML
117 lines
4.3 KiB
HTML
<?xml version="1.0" encoding="utf-8" ?>
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
|
|
<title></title>
|
|
<meta name="author" content="Arvid Norberg, arvid@rasterbar.com" />
|
|
<link rel="stylesheet" type="text/css" href="../../css/base.css" />
|
|
<link rel="stylesheet" type="text/css" href="../../css/rst.css" />
|
|
<link rel="stylesheet" href="style.css" type="text/css" />
|
|
<style type="text/css">
|
|
/* Hides from IE-mac \*/
|
|
* html pre { height: 1%; }
|
|
/* End hide from IE-mac */
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<div class="document">
|
|
<div id="container">
|
|
<div id="headerNav">
|
|
<ul>
|
|
<li class="first"><a href="/">Home</a></li>
|
|
<li><a href="../../products.html">Products</a></li>
|
|
<li><a href="../../contact.html">Contact</a></li>
|
|
</ul>
|
|
</div>
|
|
<div id="header">
|
|
<h1><span>Rasterbar Software</span></h1>
|
|
<h2><span>Software developement and consulting</span></h2>
|
|
</div>
|
|
<div id="main">
|
|
|
|
|
|
<div style="margin-bottom: 1em;">
|
|
<script type="text/javascript"><!--
|
|
google_ad_client = "pub-6034671648887442";
|
|
google_ad_slot = "7139164174";
|
|
google_ad_width = 728;
|
|
google_ad_height = 90;
|
|
//-->
|
|
</script>
|
|
<script type="text/javascript"
|
|
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
|
|
</script>
|
|
</div>
|
|
|
|
<table class="docinfo" frame="void" rules="none">
|
|
<col class="docinfo-name" />
|
|
<col class="docinfo-content" />
|
|
<tbody valign="top">
|
|
<tr><th class="docinfo-name">Author:</th>
|
|
<td>Arvid Norberg, <a class="last reference external" href="mailto:arvid@rasterbar.com">arvid@rasterbar.com</a></td></tr>
|
|
</tbody>
|
|
</table>
|
|
<div class="section" id="mainline-dht-extensions">
|
|
<h1>Mainline DHT extensions</h1>
|
|
<p>libtorrent implements a few extensions to the Mainline DHT protocol.</p>
|
|
<div class="section" id="client-identification">
|
|
<h2>client identification</h2>
|
|
<p>In each DHT packet, an extra key is inserted named "v". This is a string
|
|
describing the client and version used. This can help alot when debugging
|
|
and finding errors in client implementations. The string is encoded as four
|
|
characters, two characters describing the client and two characters interpreted
|
|
as a binary number describing the client version.</p>
|
|
<p>Currently known clients:</p>
|
|
<table border="1" class="docutils">
|
|
<colgroup>
|
|
<col width="65%" />
|
|
<col width="35%" />
|
|
</colgroup>
|
|
<tbody valign="top">
|
|
<tr><td>uTorrent</td>
|
|
<td><tt class="docutils literal"><span class="pre">UT</span></tt></td>
|
|
</tr>
|
|
<tr><td>libtorrent</td>
|
|
<td><tt class="docutils literal"><span class="pre">LT</span></tt></td>
|
|
</tr>
|
|
<tr><td>MooPolice</td>
|
|
<td><tt class="docutils literal"><span class="pre">MP</span></tt></td>
|
|
</tr>
|
|
<tr><td>GetRight</td>
|
|
<td><tt class="docutils literal"><span class="pre">GR</span></tt></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<div class="section" id="ipv6-support">
|
|
<h2>IPv6 support</h2>
|
|
<p>The DHT messages that don't support IPv6 are the <tt class="docutils literal"><span class="pre">nodes</span></tt> replies.
|
|
They encode all the contacts as 6 bytes packed together in sequence in a
|
|
string. The problem is that IPv6 endpoints cannot be encoded as 6 bytes, but
|
|
needs 18 bytes. The extension libtorrent applies is to add another key, called
|
|
<tt class="docutils literal"><span class="pre">nodes2</span></tt>.</p>
|
|
<p><tt class="docutils literal"><span class="pre">nodes2</span></tt> may be present in replies that contains a <tt class="docutils literal"><span class="pre">nodes</span></tt> key. It is encoded
|
|
as a list of strings. Each string represents one contact and is encoded as 20
|
|
bytes node-id and then a variable length encoded IP address (6 bytes in IPv4 case
|
|
and 18 bytes in IPv6 case).</p>
|
|
<p>As an optimization, libtorrent does not include the extra key in case there are
|
|
only IPv4 nodes present.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="footer">
|
|
<span>Copyright © 2005 Rasterbar Software.</span>
|
|
</div>
|
|
</div>
|
|
<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
|
|
</script>
|
|
<script type="text/javascript">
|
|
_uacct = "UA-1599045-1";
|
|
urchinTracker();
|
|
</script>
|
|
</div>
|
|
</body>
|
|
</html>
|