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Arvid Norberg 2004-06-17 20:56:49 +00:00
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219
docs/manual.html
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@ -105,9 +105,13 @@
<li><a class="reference" href="#file-format" id="id88" name="id88">file format</a></li>
</ul>
</li>
<li><a class="reference" href="#extensions" id="id89" name="id89">extensions</a></li>
<li><a class="reference" href="#filenames-checks" id="id90" name="id90">filenames checks</a></li>
<li><a class="reference" href="#aknowledgements" id="id91" name="id91">aknowledgements</a></li>
<li><a class="reference" href="#extensions" id="id89" name="id89">extensions</a><ul>
<li><a class="reference" href="#chat-messages" id="id90" name="id90">chat messages</a></li>
<li><a class="reference" href="#metadata-from-peers" id="id91" name="id91">metadata from peers</a></li>
</ul>
</li>
<li><a class="reference" href="#filename-checks" id="id92" name="id92">filename checks</a></li>
<li><a class="reference" href="#aknowledgements" id="id93" name="id93">aknowledgements</a></li>
</ul>
</div>
<div class="section" id="introduction">
@ -262,6 +266,12 @@ written.</td>
checks in the storage, including logging of
piece sorting.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">TORRENT_ENABLE_EXTENSIONS</span></tt></td>
<td>If you want extensions to be enabled, you must
build with this define. For more information on
which extensions are currently implemented, see
<a class="reference" href="#extensions">extensions</a>.</td>
</tr>
</tbody>
</table>
<p>If you experience that libtorrent uses unreasonable amounts of cpu, it will definately help to
@ -314,6 +324,12 @@ class session: public boost::noncopyable
, boost::filesystem::path const&amp; save_path
, entry const&amp; resume_data = entry());
torrent_handle add_torrent(
char const* tracker_url
, sha1_hash const&amp; info_hash
, boost::filesystem::path const&amp; save_path
, entry const&amp; resume_data = entry());
void remove_torrent(torrent_handle const&amp; h);
void set_http_settings(const http_settings&amp; settings);
@ -373,6 +389,11 @@ torrent_handle add_torrent(
entry const&amp; e
, boost::filesystem::path const&amp; save_path
, entry const&amp; resume_data = entry());
torrent_handle add_torrent(
char const* tracker_url
, sha1_hash const&amp; info_hash
, boost::filesystem::path const&amp; save_path
, entry const&amp; resume_data = entry());
</pre>
</blockquote>
<p>You add torrents through the <tt class="literal"><span class="pre">add_torrent()</span></tt> function where you give an
@ -387,6 +408,10 @@ is available. The fast-resume data can be acquired from a running torrent by cal
<tt class="literal"><span class="pre">torrent_handle::write_resume_data()</span></tt>. See <a class="reference" href="#fast-resume">fast resume</a>.</p>
<p>The <a class="reference" href="#torrent-handle">torrent_handle</a> returned by <tt class="literal"><span class="pre">add_torrent()</span></tt> can be used to retrieve information
about the torrent's progress, its peers etc. It is also used to abort a torrent.</p>
<p>The second overload that takes a tracker url and an info-hash instead of metadata (<tt class="literal"><span class="pre">entry</span></tt>)
can be used with torrents where (at least some) peers support the metadata extension. For
the overload to be available, libtorrent must be built with extensions enabled
(<tt class="literal"><span class="pre">TORRENT_ENABLE_EXTENSIONS</span></tt> defined).</p>
</div>
<div class="section" id="remove-torrent">
<h2><a name="remove-torrent">remove_torrent()</a></h2>
@ -1194,8 +1219,8 @@ any combination of the enums above. The following table describes each flag:</p>
in pieces from us and the peer has choked <strong>us</strong>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">support_extensions</span></tt></td>
<td>means that this peer supports the <a class="reference" href="http://nolar.com/azureus/extended.htm">extension protocol
as described by nolar</a>.</td>
<td>means that this peer supports the
<a class="reference" href="http://nolar.com/azureus/extended.htm">extension protocol</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">local_connection</span></tt></td>
<td>The connection was initiated by us, the peer has a
@ -1279,7 +1304,7 @@ while it does the DNS lookup, it returns a string that points to the address rep
<div class="section" id="http-settings">
<h1><a name="http-settings">http_settings</a></h1>
<p>You have some control over tracker requests through the <tt class="literal"><span class="pre">http_settings</span></tt> object. You
create it and fill it with your settings and the use <tt class="literal"><span class="pre">session::set_http_settings()</span></tt>
create it and fill it with your settings and then use <tt class="literal"><span class="pre">session::set_http_settings()</span></tt>
to apply them. You have control over proxy and authorization settings and also the user-agent
that will be sent to the tracker. The user-agent is a good way to identify your client.</p>
<pre class="literal-block">
@ -2028,28 +2053,168 @@ blocks specified by <tt class="literal"><span class="pre">bitmsk</span></tt>.</t
name of the extension is the name used in the extension-list packets,
and the payload is the data in the extended message (not counting the
length-prefix, message-id nor extension-id).</p>
<p>The extension protocol is currently disabled, since it may not be compatible
with future versions of bittorrent.</p>
<!-- These are the extensions that are currently implemented. -->
<!-- chat messages -->
<!-- - - - - - - - - - - - - - -->
<!-- Extension name: "chat" -->
<!-- The payload in the packet is a bencoded dictionary with any -->
<!-- combination of the following entries: -->
<!-- +- - - - - - - - - -+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
| "msg" | This is a string that contains a message that |
| | should be displayed to the user. |
+- - - - - - - - - -+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
| "ctrl" | This is a control string that can tell a client that |
| | it is ignored (to make the user aware of that) and |
| | it can also tell a client that it is no longer ignored.|
| | These notifications are encoded as the strings: |
| | "ignored" and "not ignored". |
| | Any unrecognized strings should be ignored. |
+- - - - - - - - - -+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+ -->
<p>Note that since this protocol relies on one of the reserved bits in the
handshake, it may be incompatible with future versions of the mainline
bittorrent client.</p>
<p>These are the extensions that are currently implemented.</p>
<div class="section" id="chat-messages">
<h2><a name="chat-messages">chat messages</a></h2>
<p>Extension name: &quot;chat&quot;</p>
<p>The payload in the packet is a bencoded dictionary with any
combination of the following entries:</p>
<blockquote>
<table border class="table">
<colgroup>
<col width="15%" />
<col width="85%" />
</colgroup>
<tbody valign="top">
<tr><td>&quot;msg&quot;</td>
<td>This is a string that contains a message that
should be displayed to the user.</td>
</tr>
<tr><td>&quot;ctrl&quot;</td>
<td>This is a control string that can tell a client that
it is ignored (to make the user aware of that) and
it can also tell a client that it is no longer ignored.
These notifications are encoded as the strings:
&quot;ignored&quot; and &quot;not ignored&quot;.
Any unrecognized strings should be ignored.</td>
</tr>
</tbody>
</table>
</blockquote>
</div>
<div class="section" id="filenames-checks">
<h1><a name="filenames-checks">filenames checks</a></h1>
<div class="section" id="metadata-from-peers">
<h2><a name="metadata-from-peers">metadata from peers</a></h2>
<p>Extension name: &quot;metadata&quot;</p>
<p>The point with this extension is that you don't have to distribute the
metadata (.torrent-file) separately. The metadata can be distributed
through the bittorrent swarm. The only thing you need to download such
a torrent is the tracker url and the info-hash of the torrent.</p>
<p>It works by assuming that the initial seeder has the metadata and that
the metadata will propagate through the network as more peers join.</p>
<p>There are three kinds of messages in the metadata extension. These packets
are put as payload to the extension message. The three packets are:</p>
<blockquote>
<ul class="simple">
<li>request metadata</li>
<li>metadata</li>
<li>don't have metadata</li>
</ul>
</blockquote>
<p>request metadata:</p>
<blockquote>
<table border class="table">
<colgroup>
<col width="17%" />
<col width="23%" />
<col width="61%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>uint8_t</td>
<td>msg_type</td>
<td>Determines the kind of message this is
0 means 'request metadata'</td>
</tr>
<tr><td>uint8_t</td>
<td>start</td>
<td>The start of the metadata block that
is requested. It is given in 256:ths
of the total size of the metadata,
since the requesting client don't know
the size of the metadata.</td>
</tr>
<tr><td>uint8_t</td>
<td>size</td>
<td>The size of the metadata block that is
requested. This is also given in
256:ths of the total size of the
metadata. The size is given as size-1.
That means that if this field is set
0, the request wants one 256:th of the
metadata.</td>
</tr>
</tbody>
</table>
</blockquote>
<p>metadata:</p>
<blockquote>
<table border class="table">
<colgroup>
<col width="17%" />
<col width="23%" />
<col width="61%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>uint8_t</td>
<td>msg_type</td>
<td>1 means 'metadata'</td>
</tr>
<tr><td>int32_t</td>
<td>total_size</td>
<td>The total size of the metadata, given
in number of bytes.</td>
</tr>
<tr><td>int32_t</td>
<td>offset</td>
<td>The offset of where the metadata block
in this message belongs in the final
metadata. This is given in bytes.</td>
</tr>
<tr><td>uint8_t[]</td>
<td>metadata</td>
<td>The actual metadata block. The size of
this part is given implicit by the
length prefix in the bittorrent
protocol packet.</td>
</tr>
</tbody>
</table>
</blockquote>
<p>Don't have metadata:</p>
<blockquote>
<table border class="table">
<colgroup>
<col width="17%" />
<col width="23%" />
<col width="61%" />
</colgroup>
<thead valign="bottom">
<tr><th>size</th>
<th>name</th>
<th>description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>uint8_t</td>
<td>msg_type</td>
<td>2 means 'I don't have metadata'.
This message is sent as a reply to a
metadata request if the the client
doesn't have any metadata.</td>
</tr>
</tbody>
</table>
</blockquote>
<p>The current implementation of this extension in libtorrent is experimental,
and not optimal in any way.</p>
</div>
</div>
<div class="section" id="filename-checks">
<h1><a name="filename-checks">filename checks</a></h1>
<p>Boost.Filesystem will by default check all its paths to make sure they conform
to filename requirements on many platforms. If you don't want this check, you can
set it to either only check for native filesystem requirements or turn it off

126
docs/manual.rst
View File

@ -173,6 +173,11 @@ table below for which defines you can use to control the build. The ``Jamfile``
| | checks in the storage, including logging of |
| | piece sorting. |
+-------------------------------+-------------------------------------------------+
| ``TORRENT_ENABLE_EXTENSIONS`` | If you want extensions to be enabled, you must |
| | build with this define. For more information on |
| | which extensions are currently implemented, see |
| | extensions_. |
+-------------------------------+-------------------------------------------------+
If you experience that libtorrent uses unreasonable amounts of cpu, it will definately help to
@ -222,6 +227,12 @@ The ``session`` class has the following synopsis::
, boost::filesystem::path const& save_path
, entry const& resume_data = entry());
torrent_handle add_torrent(
char const* tracker_url
, sha1_hash const& info_hash
, boost::filesystem::path const& save_path
, entry const& resume_data = entry());
void remove_torrent(torrent_handle const& h);
void set_http_settings(const http_settings& settings);
@ -285,6 +296,11 @@ add_torrent()
entry const& e
, boost::filesystem::path const& save_path
, entry const& resume_data = entry());
torrent_handle add_torrent(
char const* tracker_url
, sha1_hash const& info_hash
, boost::filesystem::path const& save_path
, entry const& resume_data = entry());
You add torrents through the ``add_torrent()`` function where you give an
object representing the information found in the torrent file and the path where you
@ -302,6 +318,10 @@ is available. The fast-resume data can be acquired from a running torrent by cal
The torrent_handle_ returned by ``add_torrent()`` can be used to retrieve information
about the torrent's progress, its peers etc. It is also used to abort a torrent.
The second overload that takes a tracker url and an info-hash instead of metadata (``entry``)
can be used with torrents where (at least some) peers support the metadata extension. For
the overload to be available, libtorrent must be built with extensions enabled
(``TORRENT_ENABLE_EXTENSIONS`` defined).
remove_torrent()
----------------
@ -1168,8 +1188,8 @@ any combination of the enums above. The following table describes each flag:
| ``remote_interested`` | means the same thing but that the peer is interested |
| ``remote_choked`` | in pieces from us and the peer has choked **us**. |
+-------------------------+-------------------------------------------------------+
| ``support_extensions`` | means that this peer supports the `extension protocol |
| | as described by nolar`__. |
| ``support_extensions`` | means that this peer supports the |
| | `extension protocol`__. |
+-------------------------+-------------------------------------------------------+
| ``local_connection`` | The connection was initiated by us, the peer has a |
| | listen port open, and that port is the same is in the |
@ -1270,7 +1290,7 @@ http_settings
=============
You have some control over tracker requests through the ``http_settings`` object. You
create it and fill it with your settings and the use ``session::set_http_settings()``
create it and fill it with your settings and then use ``session::set_http_settings()``
to apply them. You have control over proxy and authorization settings and also the user-agent
that will be sent to the tracker. The user-agent is a good way to identify your client.
@ -2078,20 +2098,21 @@ length-prefix, message-id nor extension-id).
__ http://nolar.com/azureus/extended.html
The extension protocol is currently disabled, since it may not be compatible
with future versions of bittorrent.
Note that since this protocol relies on one of the reserved bits in the
handshake, it may be incompatible with future versions of the mainline
bittorrent client.
.. These are the extensions that are currently implemented.
These are the extensions that are currently implemented.
.. chat messages
.. -------------
chat messages
-------------
.. Extension name: "chat"
Extension name: "chat"
.. The payload in the packet is a bencoded dictionary with any
.. combination of the following entries:
The payload in the packet is a bencoded dictionary with any
combination of the following entries:
.. +----------+--------------------------------------------------------+
+----------+--------------------------------------------------------+
| "msg" | This is a string that contains a message that |
| | should be displayed to the user. |
+----------+--------------------------------------------------------+
@ -2103,9 +2124,86 @@ with future versions of bittorrent.
| | Any unrecognized strings should be ignored. |
+----------+--------------------------------------------------------+
metadata from peers
-------------------
filenames checks
================
Extension name: "metadata"
The point with this extension is that you don't have to distribute the
metadata (.torrent-file) separately. The metadata can be distributed
through the bittorrent swarm. The only thing you need to download such
a torrent is the tracker url and the info-hash of the torrent.
It works by assuming that the initial seeder has the metadata and that
the metadata will propagate through the network as more peers join.
There are three kinds of messages in the metadata extension. These packets
are put as payload to the extension message. The three packets are:
* request metadata
* metadata
* don't have metadata
request metadata:
+-----------+---------------+----------------------------------------+
| size | name | description |
+===========+===============+========================================+
| uint8_t | msg_type | Determines the kind of message this is |
| | | 0 means 'request metadata' |
+-----------+---------------+----------------------------------------+
| uint8_t | start | The start of the metadata block that |
| | | is requested. It is given in 256:ths |
| | | of the total size of the metadata, |
| | | since the requesting client don't know |
| | | the size of the metadata. |
+-----------+---------------+----------------------------------------+
| uint8_t | size | The size of the metadata block that is |
| | | requested. This is also given in |
| | | 256:ths of the total size of the |
| | | metadata. The size is given as size-1. |
| | | That means that if this field is set |
| | | 0, the request wants one 256:th of the |
| | | metadata. |
+-----------+---------------+----------------------------------------+
metadata:
+-----------+---------------+----------------------------------------+
| size | name | description |
+===========+===============+========================================+
| uint8_t | msg_type | 1 means 'metadata' |
+-----------+---------------+----------------------------------------+
| int32_t | total_size | The total size of the metadata, given |
| | | in number of bytes. |
+-----------+---------------+----------------------------------------+
| int32_t | offset | The offset of where the metadata block |
| | | in this message belongs in the final |
| | | metadata. This is given in bytes. |
+-----------+---------------+----------------------------------------+
| uint8_t[] | metadata | The actual metadata block. The size of |
| | | this part is given implicit by the |
| | | length prefix in the bittorrent |
| | | protocol packet. |
+-----------+---------------+----------------------------------------+
Don't have metadata:
+-----------+---------------+----------------------------------------+
| size | name | description |
+===========+===============+========================================+
| uint8_t | msg_type | 2 means 'I don't have metadata'. |
| | | This message is sent as a reply to a |
| | | metadata request if the the client |
| | | doesn't have any metadata. |
+-----------+---------------+----------------------------------------+
The current implementation of this extension in libtorrent is experimental,
and not optimal in any way.
filename checks
===============
Boost.Filesystem will by default check all its paths to make sure they conform
to filename requirements on many platforms. If you don't want this check, you can

2
include/libtorrent/session.hpp
View File

@ -293,11 +293,13 @@ namespace libtorrent
, boost::filesystem::path const& save_path
, entry const& resume_data = entry());
#ifdef TORRENT_ENABLE_EXTENSIONS
torrent_handle add_torrent(
char const* tracker_url
, sha1_hash const& info_hash
, boost::filesystem::path const& save_path
, entry const& resume_data = entry());
#endif
session_status status() const;

3
src/session.cpp
View File

@ -856,6 +856,7 @@ namespace libtorrent
return torrent_handle(&m_impl, &m_checker_impl, ti.info_hash());
}
#ifdef TORRENT_ENABLE_EXTENSIONS
torrent_handle session::add_torrent(
char const* tracker_url
, sha1_hash const& info_hash
@ -892,7 +893,7 @@ namespace libtorrent
return torrent_handle(&m_impl, &m_checker_impl, info_hash);
}
#endif
void session::remove_torrent(const torrent_handle& h)
{

1
src/torrent.cpp
View File

@ -172,6 +172,7 @@ namespace libtorrent
, m_net_interface(net_interface.ip(), address::any_port)
, m_upload_bandwidth_limit(std::numeric_limits<int>::max())
, m_download_bandwidth_limit(std::numeric_limits<int>::max())
, m_save_path(save_path)
{
bencode(std::back_inserter(m_metadata), metadata["info"]);
init();