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This commit is contained in:
Arvid Norberg
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<?xml version="1.0" encoding="utf-8" ?>
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<!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 0.3.8: http://docutils.sourceforge.net/" />
|
||||
<title>Bittorrent udp-tracker protocol extension</title>
|
||||
<link rel="stylesheet" href="style.css" type="text/css" />
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||||
</head>
|
||||
<body>
|
||||
<div class="document" id="bittorrent-udp-tracker-protocol-extension">
|
||||
<h1 class="title">Bittorrent udp-tracker protocol extension</h1>
|
||||
<div class="contents topic" id="contents">
|
||||
<p class="topic-title first"><a name="contents">Contents</a></p>
|
||||
<ul class="simple">
|
||||
<li><a class="reference" href="#introduction" id="id6" name="id6">introduction</a></li>
|
||||
<li><a class="reference" href="#connecting" id="id7" name="id7">connecting</a><ul>
|
||||
<li><a class="reference" href="#client-sends-packet" id="id8" name="id8">Client sends packet:</a></li>
|
||||
<li><a class="reference" href="#server-replies-with-packet" id="id9" name="id9">Server replies with packet:</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<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>
|
||||
<li><a class="reference" href="#id3" id="id12" name="id12">Server replies with packet:</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#scraping" id="id13" name="id13">scraping</a><ul>
|
||||
<li><a class="reference" href="#id4" id="id14" name="id14">Client sends packet:</a></li>
|
||||
<li><a class="reference" href="#id5" id="id15" name="id15">Server replies with packet:</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li><a class="reference" href="#errors" id="id16" name="id16">errors</a><ul>
|
||||
<li><a class="reference" href="#server-replies-packet" id="id17" name="id17">server replies packet:</a></li>
|
||||
</ul>
|
||||
</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><ul>
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||||
<li><a class="reference" href="#authentication" id="id20" name="id20">authentication</a></li>
|
||||
</ul>
|
||||
</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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||||
<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>
|
||||
<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>
|
||||
<div class="section" id="connecting">
|
||||
<h1><a name="connecting">connecting</a></h1>
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||||
<div class="section" id="client-sends-packet">
|
||||
<h2><a name="client-sends-packet">Client sends packet:</a></h2>
|
||||
<table border="1" class="docutils">
|
||||
<colgroup>
|
||||
<col width="18%" />
|
||||
<col width="28%" />
|
||||
<col width="54%" />
|
||||
</colgroup>
|
||||
<thead valign="bottom">
|
||||
<tr><th>size</th>
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||||
<th>name</th>
|
||||
<th>description</th>
|
||||
</tr>
|
||||
</thead>
|
||||
<tbody valign="top">
|
||||
<tr><td>int64_t</td>
|
||||
<td>connection_id</td>
|
||||
<td>Must be initialized to 0x41727101980
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||||
in network byte order. This will
|
||||
identify the protocol.</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>
|
||||
</div>
|
||||
<div class="section" id="server-replies-with-packet">
|
||||
<h2><a name="server-replies-with-packet">Server replies with packet:</a></h2>
|
||||
<table border="1" class="docutils">
|
||||
<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>
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||||
<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>
|
||||
<div class="section" id="announcing">
|
||||
<h1><a name="announcing">announcing</a></h1>
|
||||
<div class="section" id="id2">
|
||||
<h2><a name="id2">Client sends packet:</a></h2>
|
||||
<table border="1" class="docutils">
|
||||
<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
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||||
establishing the connection.</td>
|
||||
</tr>
|
||||
<tr><td>int32_t</td>
|
||||
<td>action</td>
|
||||
<td>Action. in this case, 1 for announce.
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||||
See <a class="reference" href="#actions">actions</a>.</td>
|
||||
</tr>
|
||||
<tr><td>int32_t</td>
|
||||
<td>transaction_id</td>
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||||
<td>Randomized by client.</td>
|
||||
</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
|
||||
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>
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||||
<li>completed = 1</li>
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||||
<li>started = 2</li>
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||||
<li>stopped = 3</li>
|
||||
</ul>
|
||||
</blockquote>
|
||||
</td>
|
||||
</tr>
|
||||
<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
|
||||
the tracker to use the <tt class="docutils literal"><span class="pre">sender</span></tt> of
|
||||
this udp packet.</td>
|
||||
</tr>
|
||||
<tr><td>uint32_t</td>
|
||||
<td>key</td>
|
||||
<td>A unique key that is randomized by the
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||||
client.</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>
|
||||
<tr><td>uint16_t</td>
|
||||
<td>extensions</td>
|
||||
<td>See <a class="reference" href="#extensions">extensions</a></td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
<div class="section" id="id3">
|
||||
<h2><a name="id3">Server replies with packet:</a></h2>
|
||||
<table border="1" class="docutils">
|
||||
<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>.
|
||||
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
|
||||
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>
|
||||
<tr><td>int32_t</td>
|
||||
<td>leechers</td>
|
||||
<td>The number of peers in the swarm that
|
||||
has not finished downloading.</td>
|
||||
</tr>
|
||||
<tr><td>int32_t</td>
|
||||
<td>seeders</td>
|
||||
<td>The number of peers in the swarm that
|
||||
has finished downloading and are
|
||||
seeding.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>The rest of the server reply is a variable number of the following structure:</p>
|
||||
<table border="1" class="docutils">
|
||||
<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>
|
||||
<td>The peer's listen port.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section" id="scraping">
|
||||
<h1><a name="scraping">scraping</a></h1>
|
||||
<div class="section" id="id4">
|
||||
<h2><a name="id4">Client sends packet:</a></h2>
|
||||
<table border="1" class="docutils">
|
||||
<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. 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>
|
||||
<tr><td>int16_t</td>
|
||||
<td>num_info_hashes</td>
|
||||
<td>The number of info-hashes that will
|
||||
follow.</td>
|
||||
</tr>
|
||||
<tr><td>uint16_t</td>
|
||||
<td>extensions</td>
|
||||
<td>See <a class="reference" href="#extensions">extensions</a>.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>The following structure is repeated <tt class="docutils literal"><span class="pre">num_info_hashes</span></tt> times:</p>
|
||||
<table border="1" class="docutils">
|
||||
<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 that is to be scraped.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
<div class="section" id="id5">
|
||||
<h2><a name="id5">Server replies with packet:</a></h2>
|
||||
<table border="1" class="docutils">
|
||||
<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 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">
|
||||
<tr><th>size</th>
|
||||
<th>name</th>
|
||||
<th>description</th>
|
||||
</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>
|
||||
</div>
|
||||
<div class="section" id="errors">
|
||||
<h1><a name="errors">errors</a></h1>
|
||||
<p>In case of a tracker error,</p>
|
||||
<div class="section" id="server-replies-packet">
|
||||
<h2><a name="server-replies-packet">server replies packet:</a></h2>
|
||||
<table border="1" class="docutils">
|
||||
<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.
|
||||
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>
|
||||
</div>
|
||||
<div class="section" id="actions">
|
||||
<h1><a name="actions">actions</a></h1>
|
||||
<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="extensions">
|
||||
<h1><a name="extensions">extensions</a></h1>
|
||||
<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>
|
||||
<div class="section" id="authentication">
|
||||
<h2><a name="authentication">authentication</a></h2>
|
||||
<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">
|
||||
<tr><th>size</th>
|
||||
<th>name</th>
|
||||
<th>description</th>
|
||||
</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>
|
||||
<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>
|
||||
|
|
@ -59,24 +59,25 @@ namespace
|
|||
{
|
||||
int err = GetLastError();
|
||||
|
||||
#ifdef UNICODE
|
||||
wchar_t *wbuffer = 0;
|
||||
FormatMessage(
|
||||
FORMAT_MESSAGE_FROM_SYSTEM
|
||||
|FORMAT_MESSAGE_ALLOCATE_BUFFER
|
||||
, 0, err, 0, (LPWCSTR)&wbuffer, 0, 0);
|
||||
std::string tmp_utf8;
|
||||
wchar_utf8(wbuffer, tmp_utf8);
|
||||
char* buffer = tmp_utf8.c_str();
|
||||
#else
|
||||
char* buffer = 0;
|
||||
FormatMessage(
|
||||
FORMAT_MESSAGE_FROM_SYSTEM
|
||||
|FORMAT_MESSAGE_ALLOCATE_BUFFER
|
||||
, 0, err, 0, (LPSTR)&buffer, 0, 0);
|
||||
#endif
|
||||
#ifdef UNICODE
|
||||
wchar_t *wbuffer = 0;
|
||||
FormatMessage(
|
||||
FORMAT_MESSAGE_FROM_SYSTEM
|
||||
|FORMAT_MESSAGE_ALLOCATE_BUFFER
|
||||
, 0, err, 0, (LPWCSTR)&wbuffer, 0, 0);
|
||||
auto_localfree auto_free(wbuffer);
|
||||
std::string tmp_utf8;
|
||||
wchar_utf8(wbuffer, tmp_utf8);
|
||||
char* buffer = tmp_utf8.c_str();
|
||||
#else
|
||||
char* buffer = 0;
|
||||
FormatMessage(
|
||||
FORMAT_MESSAGE_FROM_SYSTEM
|
||||
|FORMAT_MESSAGE_ALLOCATE_BUFFER
|
||||
, 0, err, 0, (LPSTR)&buffer, 0, 0);
|
||||
auto_localfree auto_free(buffer);
|
||||
#endif
|
||||
|
||||
auto_localfree auto_free(buffer); // needed for exception safety
|
||||
std::stringstream s;
|
||||
s << (thrower ? thrower : "NULL") << ": " << (buffer ? buffer : "NULL");
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue