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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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2005-11-02 17:28:39 +01:00
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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2006-11-28 19:18:37 +01:00
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<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
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2005-11-02 17:28:39 +01:00
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<title>Bittorrent udp-tracker protocol extension</title>
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<meta name="author" content="Arvid Norberg, arvid@rasterbar.com" />
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2006-06-20 01:26:38 +02:00
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<link rel="stylesheet" href="style.css" type="text/css" />
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2005-04-19 11:05:15 +02:00
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</head>
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<body>
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<div class="document" id="bittorrent-udp-tracker-protocol-extension">
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<h1 class="title">Bittorrent udp-tracker protocol extension</h1>
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2005-11-01 19:30:39 +01:00
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<table class="docinfo" frame="void" rules="none">
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<col class="docinfo-name" />
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<col class="docinfo-content" />
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<tbody valign="top">
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<tr><th class="docinfo-name">Author:</th>
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<td>Arvid Norberg, <a class="last reference" href="mailto:arvid@rasterbar.com">arvid@rasterbar.com</a></td></tr>
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</tbody>
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</table>
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2006-06-20 01:26:38 +02:00
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<div class="contents topic" id="table-of-contents">
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<p class="topic-title first"><a name="table-of-contents">Table of contents</a></p>
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<ul class="simple">
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2005-11-01 19:30:39 +01:00
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<li><a class="reference" href="#introduction" id="id2" name="id2">introduction</a></li>
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<li><a class="reference" href="#connecting" id="id3" name="id3">connecting</a></li>
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<li><a class="reference" href="#announcing" id="id4" name="id4">announcing</a></li>
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<li><a class="reference" href="#scraping" id="id5" name="id5">scraping</a></li>
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<li><a class="reference" href="#errors" id="id6" name="id6">errors</a></li>
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<li><a class="reference" href="#actions" id="id7" name="id7">actions</a></li>
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<li><a class="reference" href="#extensions" id="id8" name="id8">extensions</a><ul>
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<li><a class="reference" href="#authentication" id="id9" name="id9">authentication</a></li>
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</ul>
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</li>
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<li><a class="reference" href="#credits" id="id10" name="id10">credits</a></li>
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</ul>
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</div>
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2006-11-28 19:18:37 +01:00
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<div class="section">
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<h1><a id="introduction" name="introduction">introduction</a></h1>
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<p>A tracker with the protocol "udp://" in its URI
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is supposed to be contacted using this protocol.</p>
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<p>This protocol is supported by
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<a class="reference" href="http://xbtt.sourceforge.net">xbt-tracker</a>.</p>
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<p>For additional information and descritptions of
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the terminology used in this document, see
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the <a class="reference" href="http://wiki.theory.org/index.php/BitTorrentSpecification">protocol specification</a></p>
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<p>All values are sent in network byte order (big endian). The sizes
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are specified with ANSI-C standard types.</p>
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<p>If no response to a request is received within 15 seconds, resend
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the request. If no reply has been received after 60 seconds, stop
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retrying.</p>
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</div>
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<div class="section">
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<h1><a id="connecting" name="connecting">connecting</a></h1>
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<p>Client sends packet:</p>
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<table border="1" class="docutils">
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<colgroup>
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<col width="18%" />
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<col width="28%" />
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<col width="54%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">size</th>
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<th class="head">name</th>
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<th class="head">description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td>int64_t</td>
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<td>connection_id</td>
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<td>Must be initialized to 0x41727101980
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in network byte order. This will
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identify the protocol.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>action</td>
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<td>0 for a connection request</td>
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</tr>
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<tr><td>int32_t</td>
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<td>transaction_id</td>
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<td>Randomized by client.</td>
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</tr>
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</tbody>
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</table>
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<p>Server replies with packet:</p>
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<table border="1" class="docutils">
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<colgroup>
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<col width="18%" />
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<col width="28%" />
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<col width="54%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">size</th>
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<th class="head">name</th>
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<th class="head">description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td>int32_t</td>
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<td>action</td>
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<td>Describes the type of packet, in this
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case it should be 0, for connect.
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If 3 (for error) see <a class="reference" href="#errors">errors</a>.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>transaction_id</td>
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<td>Must match the transaction_id sent
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from the client.</td>
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</tr>
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<tr><td>int64_t</td>
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<td>connection_id</td>
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<td>A connection id, this is used when
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further information is exchanged with
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the tracker, to identify you.
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This connection id can be reused for
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multiple requests, but if it's cached
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for too long, it will not be valid
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anymore.</td>
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</tr>
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</tbody>
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</table>
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</div>
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2006-11-28 19:18:37 +01:00
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<div class="section">
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<h1><a id="announcing" name="announcing">announcing</a></h1>
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<p>Client sends packet:</p>
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<table border="1" class="docutils">
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<colgroup>
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<col width="18%" />
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<col width="28%" />
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<col width="54%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">size</th>
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<th class="head">name</th>
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<th class="head">description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td>int64_t</td>
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<td>connection_id</td>
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<td>The connection id acquired from
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establishing the connection.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>action</td>
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<td>Action. in this case, 1 for announce.
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See <a class="reference" href="#actions">actions</a>.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>transaction_id</td>
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<td>Randomized by client.</td>
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</tr>
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<tr><td>int8_t[20]</td>
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<td>info_hash</td>
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<td>The info-hash of the torrent you want
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announce yourself in.</td>
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</tr>
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<tr><td>int8_t[20]</td>
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<td>peer_id</td>
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<td>Your peer id.</td>
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</tr>
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<tr><td>int64_t</td>
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<td>downloaded</td>
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<td>The number of byte you've downloaded
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in this session.</td>
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</tr>
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<tr><td>int64_t</td>
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<td>left</td>
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<td>The number of bytes you have left to
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download until you're finished.</td>
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</tr>
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<tr><td>int64_t</td>
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<td>uploaded</td>
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<td>The number of bytes you have uploaded
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in this session.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>event</td>
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<td><p class="first">The event, one of</p>
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<blockquote class="last">
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<ul class="simple">
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<li>none = 0</li>
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<li>completed = 1</li>
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<li>started = 2</li>
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<li>stopped = 3</li>
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</ul>
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</blockquote>
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</td>
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</tr>
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<tr><td>uint32_t</td>
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<td>ip</td>
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<td>Your ip address. Set to 0 if you want
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the tracker to use the <tt class="docutils literal"><span class="pre">sender</span></tt> of
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this udp packet.</td>
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</tr>
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<tr><td>uint32_t</td>
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<td>key</td>
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<td>A unique key that is randomized by the
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client.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>num_want</td>
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<td>The maximum number of peers you want
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in the reply. Use -1 for default.</td>
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</tr>
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<tr><td>uint16_t</td>
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<td>port</td>
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<td>The port you're listening on.</td>
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</tr>
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<tr><td>uint16_t</td>
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<td>extensions</td>
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<td>See <a class="reference" href="#extensions">extensions</a></td>
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</tr>
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</tbody>
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</table>
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2005-11-01 19:30:39 +01:00
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<p>Server replies with packet:</p>
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<table border="1" class="docutils">
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<colgroup>
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<col width="18%" />
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<col width="28%" />
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<col width="54%" />
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</colgroup>
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<thead valign="bottom">
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2006-05-20 19:59:17 +02:00
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<tr><th class="head">size</th>
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<th class="head">name</th>
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<th class="head">description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td>int32_t</td>
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<td>action</td>
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<td>The action this is a reply to. Should
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in this case be 1 for announce.
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If 3 (for error) see <a class="reference" href="#errors">errors</a>.
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See <a class="reference" href="#actions">actions</a>.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>transaction_id</td>
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<td>Must match the transaction_id sent
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in the announce request.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>interval</td>
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<td>the number of seconds you should wait
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until reannouncing yourself.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>leechers</td>
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<td>The number of peers in the swarm that
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has not finished downloading.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>seeders</td>
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<td>The number of peers in the swarm that
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has finished downloading and are
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seeding.</td>
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</tr>
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</tbody>
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</table>
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<p>The rest of the server reply is a variable number of the following structure:</p>
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<table border="1" class="docutils">
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<colgroup>
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<col width="18%" />
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<col width="28%" />
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<col width="54%" />
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</colgroup>
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<thead valign="bottom">
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2006-05-20 19:59:17 +02:00
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<tr><th class="head">size</th>
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<th class="head">name</th>
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<th class="head">description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td>int32_t</td>
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<td>ip</td>
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<td>The ip of a peer in the swarm.</td>
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</tr>
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<tr><td>uint16_t</td>
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<td>port</td>
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<td>The peer's listen port.</td>
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</tr>
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</tbody>
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</table>
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</div>
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2006-11-28 19:18:37 +01:00
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<div class="section">
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<h1><a id="scraping" name="scraping">scraping</a></h1>
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2005-11-01 19:30:39 +01:00
|
|
|
<p>Client sends packet:</p>
|
2005-04-19 11:05:15 +02:00
|
|
|
<table border="1" class="docutils">
|
|
|
|
|
<colgroup>
|
|
|
|
|
<col width="18%" />
|
|
|
|
|
<col width="28%" />
|
|
|
|
|
<col width="54%" />
|
|
|
|
|
</colgroup>
|
|
|
|
|
<thead valign="bottom">
|
2006-05-20 19:59:17 +02:00
|
|
|
<tr><th class="head">size</th>
|
|
|
|
|
<th class="head">name</th>
|
|
|
|
|
<th class="head">description</th>
|
2005-04-19 11:05:15 +02:00
|
|
|
</tr>
|
|
|
|
|
</thead>
|
|
|
|
|
<tbody valign="top">
|
|
|
|
|
<tr><td>int64_t</td>
|
|
|
|
|
<td>connection_id</td>
|
|
|
|
|
<td>The connection id retreived from the
|
|
|
|
|
establishing of the connection.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
<tr><td>int32_t</td>
|
|
|
|
|
<td>action</td>
|
|
|
|
|
<td>The action, in this case, 2 for
|
|
|
|
|
scrape. See <a class="reference" href="#actions">actions</a>.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
<tr><td>int32_t</td>
|
|
|
|
|
<td>transaction_id</td>
|
|
|
|
|
<td>Randomized by client.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
</tbody>
|
|
|
|
|
</table>
|
2008-02-07 08:09:52 +01:00
|
|
|
<p>The following structure is repeated for each info-hash to scrape, but limited by
|
|
|
|
|
the MTU.</p>
|
2005-04-19 11:05:15 +02:00
|
|
|
<table border="1" class="docutils">
|
|
|
|
|
<colgroup>
|
|
|
|
|
<col width="18%" />
|
|
|
|
|
<col width="28%" />
|
|
|
|
|
<col width="54%" />
|
|
|
|
|
</colgroup>
|
|
|
|
|
<thead valign="bottom">
|
2006-05-20 19:59:17 +02:00
|
|
|
<tr><th class="head">size</th>
|
|
|
|
|
<th class="head">name</th>
|
|
|
|
|
<th class="head">description</th>
|
2005-04-19 11:05:15 +02:00
|
|
|
</tr>
|
|
|
|
|
</thead>
|
|
|
|
|
<tbody valign="top">
|
|
|
|
|
<tr><td>int8_t[20]</td>
|
|
|
|
|
<td>info_hash</td>
|
|
|
|
|
<td>The info hash that is to be scraped.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
</tbody>
|
|
|
|
|
</table>
|
2005-11-01 19:30:39 +01:00
|
|
|
<p>Server replies with packet:</p>
|
2005-04-19 11:05:15 +02:00
|
|
|
<table border="1" class="docutils">
|
|
|
|
|
<colgroup>
|
|
|
|
|
<col width="18%" />
|
|
|
|
|
<col width="28%" />
|
|
|
|
|
<col width="54%" />
|
|
|
|
|
</colgroup>
|
|
|
|
|
<thead valign="bottom">
|
2006-05-20 19:59:17 +02:00
|
|
|
<tr><th class="head">size</th>
|
|
|
|
|
<th class="head">name</th>
|
|
|
|
|
<th class="head">description</th>
|
2005-04-19 11:05:15 +02:00
|
|
|
</tr>
|
|
|
|
|
</thead>
|
|
|
|
|
<tbody valign="top">
|
|
|
|
|
<tr><td>int32_t</td>
|
|
|
|
|
<td>action</td>
|
|
|
|
|
<td>The action, should in this case be
|
|
|
|
|
2 for scrape.
|
|
|
|
|
If 3 (for error) see <a class="reference" href="#errors">errors</a>.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
<tr><td>int32_t</td>
|
|
|
|
|
<td>transaction_id</td>
|
|
|
|
|
<td>Must match the sent transaction id.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
</tbody>
|
|
|
|
|
</table>
|
|
|
|
|
<p>The rest of the packet contains the following structures once for each info-hash
|
|
|
|
|
you asked in the scrape request.</p>
|
|
|
|
|
<table border="1" class="docutils">
|
|
|
|
|
<colgroup>
|
|
|
|
|
<col width="18%" />
|
|
|
|
|
<col width="28%" />
|
|
|
|
|
<col width="54%" />
|
|
|
|
|
</colgroup>
|
|
|
|
|
<thead valign="bottom">
|
2006-05-20 19:59:17 +02:00
|
|
|
<tr><th class="head">size</th>
|
|
|
|
|
<th class="head">name</th>
|
|
|
|
|
<th class="head">description</th>
|
2005-04-19 11:05:15 +02:00
|
|
|
</tr>
|
|
|
|
|
</thead>
|
|
|
|
|
<tbody valign="top">
|
|
|
|
|
<tr><td>int32_t</td>
|
|
|
|
|
<td>complete</td>
|
|
|
|
|
<td>The total number of completed
|
|
|
|
|
downloads.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
<tr><td>int32_t</td>
|
|
|
|
|
<td>downloaded</td>
|
|
|
|
|
<td>The current number of connected seeds.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
<tr><td>int32_t</td>
|
|
|
|
|
<td>incomplete</td>
|
|
|
|
|
<td>The current number of connected
|
|
|
|
|
leechers.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
</tbody>
|
|
|
|
|
</table>
|
|
|
|
|
</div>
|
2006-11-28 19:18:37 +01:00
|
|
|
<div class="section">
|
|
|
|
|
<h1><a id="errors" name="errors">errors</a></h1>
|
2005-04-19 11:05:15 +02:00
|
|
|
<p>In case of a tracker error,</p>
|
2005-11-01 19:30:39 +01:00
|
|
|
<p>server replies packet:</p>
|
2005-04-19 11:05:15 +02:00
|
|
|
<table border="1" class="docutils">
|
|
|
|
|
<colgroup>
|
|
|
|
|
<col width="18%" />
|
|
|
|
|
<col width="28%" />
|
|
|
|
|
<col width="54%" />
|
|
|
|
|
</colgroup>
|
|
|
|
|
<thead valign="bottom">
|
2006-05-20 19:59:17 +02:00
|
|
|
<tr><th class="head">size</th>
|
|
|
|
|
<th class="head">name</th>
|
|
|
|
|
<th class="head">description</th>
|
2005-04-19 11:05:15 +02:00
|
|
|
</tr>
|
|
|
|
|
</thead>
|
|
|
|
|
<tbody valign="top">
|
|
|
|
|
<tr><td>int32_t</td>
|
|
|
|
|
<td>action</td>
|
|
|
|
|
<td>The action, in this case 3, for error.
|
|
|
|
|
See <a class="reference" href="#actions">actions</a>.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
<tr><td>int32_t</td>
|
|
|
|
|
<td>transaction_id</td>
|
|
|
|
|
<td>Must match the transaction_id sent
|
|
|
|
|
from the client.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
<tr><td>int8_t[]</td>
|
|
|
|
|
<td>error_string</td>
|
|
|
|
|
<td>The rest of the packet is a string
|
|
|
|
|
describing the error.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
</tbody>
|
|
|
|
|
</table>
|
|
|
|
|
</div>
|
2006-11-28 19:18:37 +01:00
|
|
|
<div class="section">
|
|
|
|
|
<h1><a id="actions" name="actions">actions</a></h1>
|
2005-04-19 11:05:15 +02:00
|
|
|
<p>The action fields has the following encoding:</p>
|
|
|
|
|
<blockquote>
|
|
|
|
|
<ul class="simple">
|
|
|
|
|
<li>connect = 0</li>
|
|
|
|
|
<li>announce = 1</li>
|
|
|
|
|
<li>scrape = 2</li>
|
|
|
|
|
<li>error = 3 (only in server replies)</li>
|
|
|
|
|
</ul>
|
|
|
|
|
</blockquote>
|
|
|
|
|
</div>
|
2006-11-28 19:18:37 +01:00
|
|
|
<div class="section">
|
|
|
|
|
<h1><a id="extensions" name="extensions">extensions</a></h1>
|
2005-04-19 11:05:15 +02:00
|
|
|
<p>The extensions field is a bitmask. The following
|
|
|
|
|
bits are assigned:</p>
|
|
|
|
|
<blockquote>
|
|
|
|
|
<ul class="simple">
|
|
|
|
|
<li>1 = <a class="reference" href="#authentication">authentication</a>.</li>
|
|
|
|
|
</ul>
|
|
|
|
|
</blockquote>
|
2006-11-28 19:18:37 +01:00
|
|
|
<div class="section">
|
|
|
|
|
<h2><a id="authentication" name="authentication">authentication</a></h2>
|
2005-04-19 11:05:15 +02:00
|
|
|
<p>The packet will have an authentication part
|
|
|
|
|
appended to it. It has the following format:</p>
|
|
|
|
|
<table border="1" class="docutils">
|
|
|
|
|
<colgroup>
|
|
|
|
|
<col width="18%" />
|
|
|
|
|
<col width="28%" />
|
|
|
|
|
<col width="54%" />
|
|
|
|
|
</colgroup>
|
|
|
|
|
<thead valign="bottom">
|
2006-05-20 19:59:17 +02:00
|
|
|
<tr><th class="head">size</th>
|
|
|
|
|
<th class="head">name</th>
|
|
|
|
|
<th class="head">description</th>
|
2005-04-19 11:05:15 +02:00
|
|
|
</tr>
|
|
|
|
|
</thead>
|
|
|
|
|
<tbody valign="top">
|
|
|
|
|
<tr><td>int8_t</td>
|
|
|
|
|
<td>username_length</td>
|
|
|
|
|
<td>The number of characters in the
|
|
|
|
|
username.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
<tr><td>int8_t[]</td>
|
|
|
|
|
<td>username</td>
|
|
|
|
|
<td>The username, the number of characters
|
|
|
|
|
as specified in the previous field.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
<tr><td>uint8_t[8]</td>
|
|
|
|
|
<td>passwd_hash</td>
|
|
|
|
|
<td>sha1(packet + sha1(password))
|
|
|
|
|
The packet in this case means the
|
|
|
|
|
entire packet except these 8 bytes
|
|
|
|
|
that are the password hash. These are
|
|
|
|
|
the 8 first bytes (most significant)
|
|
|
|
|
from the 20 bytes hash calculated.</td>
|
|
|
|
|
</tr>
|
|
|
|
|
</tbody>
|
|
|
|
|
</table>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
2006-11-28 19:18:37 +01:00
|
|
|
<div class="section">
|
|
|
|
|
<h1><a id="credits" name="credits">credits</a></h1>
|
2005-04-19 11:05:15 +02:00
|
|
|
<p>Protocol designed by Olaf van der Spek</p>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
