2004-01-22 23:45:52 +01:00
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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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<meta name="generator" content="Docutils 0.3.1: http://docutils.sourceforge.net/" />
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<title>Bittorrent udp-tracker protocol extension</title>
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<link rel="stylesheet" href="style.css" type="text/css" />
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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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2004-04-06 22:11:18 +02:00
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<div class="contents topic" id="contents">
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<p class="topic-title"><a name="contents">Contents</a></p>
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<ul class="simple">
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<li><a class="reference" href="#introduction" id="id6" name="id6">introduction</a></li>
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<li><a class="reference" href="#connecting" id="id7" name="id7">connecting</a><ul>
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<li><a class="reference" href="#client-sends-packet" id="id8" name="id8">Client sends packet:</a></li>
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<li><a class="reference" href="#server-replies-with-packet" id="id9" name="id9">Server replies with packet:</a></li>
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</ul>
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</li>
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<li><a class="reference" href="#announcing" id="id10" name="id10">announcing</a><ul>
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<li><a class="reference" href="#id2" id="id11" name="id11">Client sends packet:</a></li>
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<li><a class="reference" href="#id3" id="id12" name="id12">Server replies with packet:</a></li>
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</ul>
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</li>
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<li><a class="reference" href="#scraping" id="id13" name="id13">scraping</a><ul>
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<li><a class="reference" href="#id4" id="id14" name="id14">Client sends packet:</a></li>
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<li><a class="reference" href="#id5" id="id15" name="id15">Server replies with packet:</a></li>
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</ul>
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</li>
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<li><a class="reference" href="#errors" id="id16" name="id16">errors</a><ul>
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<li><a class="reference" href="#server-replies-packet" id="id17" name="id17">server replies packet:</a></li>
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</ul>
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</li>
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<li><a class="reference" href="#actions" id="id18" name="id18">actions</a></li>
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<li><a class="reference" href="#extensions" id="id19" name="id19">extensions</a></li>
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<li><a class="reference" href="#authentication" id="id20" name="id20">authentication</a></li>
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<li><a class="reference" href="#credits" id="id21" name="id21">credits</a></li>
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</ul>
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</div>
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<div class="section" id="introduction">
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<h1><a name="introduction">introduction</a></h1>
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2004-01-22 23:45:52 +01:00
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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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2004-04-06 22:11:18 +02:00
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</div>
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2004-01-22 23:45:52 +01:00
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<div class="section" id="connecting">
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<h1><a name="connecting">connecting</a></h1>
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2004-04-03 00:21:20 +02:00
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<div class="section" id="client-sends-packet">
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<h2><a name="client-sends-packet">Client sends packet:</a></h2>
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2004-01-22 23:45:52 +01:00
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>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>Not used, ignored by tracker.</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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2004-04-03 00:21:20 +02:00
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</div>
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<div class="section" id="server-replies-with-packet">
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<h2><a name="server-replies-with-packet">Server replies with packet:</a></h2>
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2004-01-22 23:45:52 +01:00
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>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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2004-04-03 00:21:20 +02:00
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</div>
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2004-01-22 23:45:52 +01:00
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<div class="section" id="announcing">
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<h1><a name="announcing">announcing</a></h1>
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2004-04-03 00:21:20 +02:00
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<div class="section" id="id2">
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<h2><a name="id2">Client sends packet:</a></h2>
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2004-01-22 23:45:52 +01:00
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>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.</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="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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2004-04-03 00:21:20 +02:00
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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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2004-01-22 23:45:52 +01:00
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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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2004-04-06 22:11:18 +02:00
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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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2004-04-03 00:21:20 +02:00
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id3">
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<h2><a name="id3">Server replies with packet:</a></h2>
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2004-01-22 23:45:52 +01:00
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>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>.</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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2004-04-03 00:21:20 +02:00
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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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2004-01-22 23:45:52 +01:00
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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 class="table">
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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>size</th>
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<th>name</th>
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<th>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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2004-01-28 12:37:46 +01:00
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<td>The peer's listen port.</td>
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2004-01-22 23:45:52 +01:00
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</tr>
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</tbody>
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</table>
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</div>
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2004-04-03 00:21:20 +02:00
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</div>
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2004-01-22 23:45:52 +01:00
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<div class="section" id="scraping">
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<h1><a name="scraping">scraping</a></h1>
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2004-04-03 00:21:20 +02:00
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<div class="section" id="id4">
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<h2><a name="id4">Client sends packet:</a></h2>
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2004-01-22 23:45:52 +01:00
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>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 retreived from the
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establishing of 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>The action, in this case, 2 for
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scrape.</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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2004-04-06 22:11:18 +02:00
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<tr><td>int16_t</td>
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<td>num_info_hashes</td>
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<td>The number of info-hashes that will
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follow.</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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2004-04-03 00:21:20 +02:00
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</tbody>
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</table>
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2004-04-06 22:11:18 +02:00
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<p>The following structure is repeated <tt class="literal"><span class="pre">num_info_hashes</span></tt> times:</p>
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2004-04-03 00:21:20 +02:00
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>description</th>
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</tr>
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</thead>
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<tbody valign="top">
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2004-01-28 12:37:46 +01:00
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<tr><td>int8_t[20]</td>
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2004-01-22 23:45:52 +01:00
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<td>info_hash</td>
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<td>The info hash that is to be scraped.</td>
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</tr>
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</tbody>
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</table>
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2004-04-03 00:21:20 +02:00
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</div>
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<div class="section" id="id5">
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<h2><a name="id5">Server replies with packet:</a></h2>
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2004-01-22 23:45:52 +01:00
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>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, should in this case be
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2 for scrape.
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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 sent transaction id.</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 packet contains a variable number of the following structures:</p>
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>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>complete</td>
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<td>The total number of completed
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downloads.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>downloaded</td>
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<td>The current number of connected seeds.</td>
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</tr>
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<tr><td>int32_t</td>
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<td>incomplete</td>
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<td>The current number of connected
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leechers.</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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2004-04-03 00:21:20 +02:00
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</div>
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2004-01-22 23:45:52 +01:00
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<div class="section" id="errors">
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<h1><a name="errors">errors</a></h1>
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2004-04-03 00:21:20 +02:00
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<p>In case of a tracker error,</p>
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<div class="section" id="server-replies-packet">
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<h2><a name="server-replies-packet">server replies packet:</a></h2>
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2004-01-22 23:45:52 +01:00
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>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, in this case 3, for error.</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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2004-01-28 12:37:46 +01:00
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<tr><td>int8_t[]</td>
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2004-01-22 23:45:52 +01:00
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<td>error_string</td>
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<td>The rest of the packet is a string
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describing the error.</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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2004-04-03 00:21:20 +02:00
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</div>
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2004-01-22 23:45:52 +01:00
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<div class="section" id="actions">
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<h1><a name="actions">actions</a></h1>
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2004-01-23 01:42:12 +01:00
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<p>The action fields has the following encoding:</p>
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2004-01-22 23:45:52 +01:00
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<blockquote>
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<ul class="simple">
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<li>connect = 0</li>
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<li>announce = 1</li>
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<li>scrape = 2</li>
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<li>error = 3 (only in server replies)</li>
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</ul>
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</blockquote>
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</div>
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2004-04-06 22:11:18 +02:00
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<div class="section" id="extensions">
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<h1><a name="extensions">extensions</a></h1>
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<p>The extensions field is a bitmask. The following
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bits are assigned:</p>
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<blockquote>
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<ul class="simple">
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<li>1 = <a class="reference" href="#authentication">authentication</a>.</li>
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</ul>
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</blockquote>
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</div>
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<div class="section" id="authentication">
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<h1><a name="authentication">authentication</a></h1>
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<p>The packet will have an authentication part
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appended to it. It has the following format:</p>
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<table border class="table">
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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>size</th>
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<th>name</th>
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<th>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>int8_t</td>
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<td>username_length</td>
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<td>The number of characters in the
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username.</td>
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</tr>
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<tr><td>int8_t[]</td>
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<td>username</td>
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<td>The username, the number of characters
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as specified in the previous field.</td>
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</tr>
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<tr><td>uint8_t[20]</td>
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<td>passwd_hash</td>
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<td>sha1(packet + sha1(password))
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The packet in this case means the
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entire packet except these 20 bytes
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that are the password hash.</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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2004-01-22 23:45:52 +01:00
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<div class="section" id="credits">
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<h1><a name="credits">credits</a></h1>
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<p>Protocol designed by Olaf van der Spek</p>
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</div>
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</div>
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</body>
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</html>
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