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<title>Bittorrent udp-tracker protocol extension</title>
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<div class="document" id="bittorrent-udp-tracker-protocol-extension">
<h1 class="title">Bittorrent udp-tracker protocol extension</h1>
<p>A tracker with the protocol &quot;udp://&quot; in its URI
is supposed to be contacted using this protocol.</p>
<p>This protocol is supported by
<a class="reference" href="http://xbtt.sourceforge.net">xbt-tracker</a>.</p>
<p>For additional information and descritptions of
the terminology used in this document, see
the <a class="reference" href="http://wiki.theory.org/index.php/BitTorrentSpecification">protocol specification</a></p>
<p>All values are sent in network byte order (big endian). The sizes
are specified with ANSI-C standard types.</p>
<p>If no response to a request is received within 15 seconds, resend
the request. If no reply has been received after 60 seconds, stop
retrying.</p>
<div class="section" id="connecting">
<h1><a name="connecting">connecting</a></h1>
<p>Client sends packet:</p>
<table border class="table">
<colgroup>
<col width="18%" />
<col width="28%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>int64_t</td>
<td>connection_id</td>
<td>Not used, ignored by tracker.</td>
</tr>
<tr><td>int32_t</td>
<td>action</td>
<td>0 for a connection request</td>
</tr>
<tr><td>int32_t</td>
<td>transaction_id</td>
<td>Randomized by client.</td>
</tr>
</tbody>
</table>
<p>Server replies with packet:</p>
<table border class="table">
<colgroup>
<col width="18%" />
<col width="28%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>int32_t</td>
<td>action</td>
<td>Describes the type of packet, in this
case it should be 0, for connect.
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 transaction_id sent
from the client.</td>
</tr>
<tr><td>int64_t</td>
<td>connection_id</td>
<td>A connection id, this is used when
further information is exchanged with
the tracker, to identify you.
This connection id can be reused for
multiple requests, but if it's cached
for too long, it will not be valid
anymore.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="announcing">
<h1><a name="announcing">announcing</a></h1>
<p>Client sends packet:</p>
<table border class="table">
<colgroup>
<col width="18%" />
<col width="28%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>int64_t</td>
<td>connection_id</td>
<td>The connection id acquired from
establishing the connection.</td>
</tr>
<tr><td>int32_t</td>
<td>action</td>
<td>Action. in this case, 1 for announce.</td>
</tr>
<tr><td>int32_t</td>
<td>transaction_id</td>
<td>Randomized by client.</td>
</tr>
<tr><td>int8_t[20]</td>
<td>info_hash</td>
<td>The info-hash of the torrent you want
announce yourself in.</td>
</tr>
<tr><td>int8_t[20]</td>
<td>peer_id</td>
<td>Your peer id.</td>
</tr>
<tr><td>int64_t</td>
<td>downloaded</td>
<td>The number of byte you've downloaded
in this session.</td>
</tr>
<tr><td>int64_t</td>
<td>left</td>
<td>The number of bytes you have left to
download until you're finished.</td>
</tr>
<tr><td>int64_t</td>
<td>uploaded</td>
<td>The number of bytes you have uploaded
in this session.</td>
</tr>
<tr><td>int32_t</td>
<td>event</td>
<td><p class="first">The event, one of</p>
<blockquote class="last">
<ul class="simple">
<li>none = 0</li>
<li>completed = 1</li>
<li>started = 2</li>
<li>stopped = 3</li>
</ul>
</blockquote>
</td>
</tr>
<tr><td>uint32_t</td>
<td>ip</td>
<td>Your ip address. Set to 0 if you want
the tracker to use the <tt class="literal"><span class="pre">sender</span></tt> of
this udp packet.</td>
</tr>
<tr><td>int32_t</td>
<td>num_want</td>
<td>The maximum number of peers you want
in the reply. Use -1 for default.</td>
</tr>
<tr><td>uint16_t</td>
<td>port</td>
<td>The port you're listening on.</td>
</tr>
</tbody>
</table>
<p>Server replies with packet:</p>
<table border class="table">
<colgroup>
<col width="18%" />
<col width="28%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>int32_t</td>
<td>action</td>
<td>The action this is a reply to. Should
in this case be 1 for announce.
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 transaction_id sent
in the announce request.</td>
</tr>
<tr><td>int32_t</td>
<td>interval</td>
<td>the number of seconds you should wait
until reannouncing yourself.</td>
</tr>
</tbody>
</table>
<p>The rest of the server reply is a variable number of the following structure:</p>
<table border class="table">
<colgroup>
<col width="18%" />
<col width="28%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>int32_t</td>
<td>ip</td>
<td>The ip of a peer in the swarm.</td>
</tr>
<tr><td>uint16_t</td>
<td>port</td>
2004-01-28 12:37:46 +01:00
<td>The peer's listen port.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="scraping">
<h1><a name="scraping">scraping</a></h1>
<p>Client sends packet:</p>
<table border class="table">
<colgroup>
<col width="18%" />
<col width="28%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</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.</td>
</tr>
<tr><td>int32_t</td>
<td>transaction_id</td>
<td>Randomized by client.</td>
</tr>
2004-01-28 12:37:46 +01:00
<tr><td>int8_t[20]</td>
<td>info_hash</td>
<td>The info hash that is to be scraped.</td>
</tr>
</tbody>
</table>
<p>Server replies with packet:</p>
<table border class="table">
<colgroup>
<col width="18%" />
<col width="28%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</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 a variable number of the following structures:</p>
<table border class="table">
<colgroup>
<col width="18%" />
<col width="28%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>int8_t[20]</td>
<td>info_hash</td>
<td>The info hash of this info.</td>
</tr>
<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>
<div class="section" id="errors">
<h1><a name="errors">errors</a></h1>
<p>In case of a tracker error, the server replies with this packet:</p>
<table border class="table">
<colgroup>
<col width="18%" />
<col width="28%" />
<col width="54%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>int32_t</td>
<td>action</td>
<td>The action, in this case 3, for error.</td>
</tr>
<tr><td>int32_t</td>
<td>transaction_id</td>
<td>Must match the transaction_id sent
from the client.</td>
</tr>
2004-01-28 12:37:46 +01:00
<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>
<div class="section" id="actions">
<h1><a name="actions">actions</a></h1>
2004-01-23 01:42:12 +01:00
<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>
<div class="section" id="credits">
<h1><a name="credits">credits</a></h1>
<p>Protocol designed by Olaf van der Spek</p>
</div>
</div>
</body>
</html>