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< h1 > < span > Rasterbar Software< / span > < / h1 >
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< h1 class = "title" > libtorrent manual< / h1 >
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< tr > < th class = "docinfo-name" > Author:< / th >
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< td > Arvid Norberg, < a class = "last reference external" href = "mailto:arvid@rasterbar.com" > arvid@ rasterbar.com< / a > < / td > < / tr >
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< p class = "topic-title first" > Table of contents< / p >
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< ul class = "simple" >
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< li > < a class = "reference internal" href = "#introduction" id = "id4" > introduction< / a > < / li >
< li > < a class = "reference internal" href = "#features" id = "id5" > features< / a > < / li >
< li > < a class = "reference internal" href = "#portability" id = "id6" > portability< / a > < / li >
< li > < a class = "reference internal" href = "#license" id = "id7" > license< / a > < / li >
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< div class = "section" id = "introduction" >
< h1 > introduction< / h1 >
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< p > libtorrent is a C++ library that aims to be a good alternative to all the
other bittorrent implementations around. It is a
library and not a full featured client, although it comes with a working
example client.< / p >
< p > The main goals of libtorrent are:< / p >
< ul class = "simple" >
< li > to be cpu efficient< / li >
< li > to be memory efficient< / li >
< li > to be very easy to use< / li >
< / ul >
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< div class = "section" id = "features" >
< h1 > features< / h1 >
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< p > libtorrent is still being developed, however it is stable. It is an ongoing
project (including this documentation). The current state includes the
following features:< / p >
< ul class = "simple" >
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< li > trackerless torrents (using the Mainline kademlia DHT protocol) with
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some < a class = "reference external" href = "dht_extensions.html" > DHT extensions< / a > .< / li >
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< li > support for IPv6< / li >
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< li > NAT-PMP and UPnP support (automatic port mapping on routers that supports it)< / li >
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< li > piece-wise, unordered, incremental file allocation< / li >
< li > uses separate threads for checking files and for main downloader, with a
fool-proof thread-safe library interface. (i.e. There's no way for the
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user to cause a deadlock). (see < a class = "reference external" href = "manual.html#threads" > threads< / a > )< / li >
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< li > adjusts the length of the request queue depending on download rate.< / li >
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< li > multitracker extension support (as < a class = "reference external" href = "http://home.elp.rr.com/tur/multitracker-spec.txt" > specified by John Hoffman< / a > )< / li >
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< li > supports files > 2 gigabytes.< / li >
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< li > serves multiple torrents on a single port and in a single thread< / li >
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< li > fast resume support, a way to get rid of the costly piece check at the
start of a resumed torrent. Saves the storage state, piece_picker state
as well as all local peers in a separate fast-resume file.< / li >
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< li > < a class = "reference external" href = "manual.html#http-seeding" > HTTP seeding< / a > , as < a class = "reference external" href = "http://www.getright.com/seedtorrent.html" > specified by Michael Burford of GetRight< / a > .< / li >
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< li > piece picking on block-level (as opposed to piece-level).
This means it can download parts of the same piece from different peers.
It will also prefer to download whole pieces from single peers if the
download speed is high enough from that particular peer.< / li >
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< li > supports the < a class = "reference external" href = "udp_tracker_protocol.html" > udp-tracker protocol< / a > by Olaf van der Spek.< / li >
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< li > queues torrents for file check, instead of checking all of them in parallel.< / li >
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< li > supports http proxies and basic proxy authentication< / li >
< li > gzipped tracker-responses< / li >
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< li > can limit the upload and download bandwidth usage and the maximum number of
unchoked peers< / li >
< li > implements fair trade. User settable trade-ratio, must at least be 1:1,
but one can choose to trade 1 for 2 or any other ratio that isn't unfair
to the other party.< / li >
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< li > supports an < a class = "reference external" href = "extension_protocol.html" > extension protocol< / a > . See < a class = "reference external" href = "manual.html#extensions" > extensions< / a > .< / li >
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< li > supports the < tt class = "docutils literal" > < span class = "pre" > no_peer_id=1< / span > < / tt > extension that will ease the load off trackers.< / li >
< li > possibility to limit the number of connections.< / li >
< li > delays have messages if there's no other outgoing traffic to the peer, and
doesn't send have messages to peers that already has the piece. This saves
bandwidth.< / li >
< li > does not have any requirements on the piece order in a torrent that it
resumes. This means it can resume a torrent downloaded by any client.< / li >
< li > supports the < tt class = "docutils literal" > < span class = "pre" > compact=1< / span > < / tt > tracker parameter.< / li >
< li > selective downloading. The ability to select which parts of a torrent you
want to download.< / li >
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< li > ip filter to disallow ip addresses and ip ranges from connecting and
being connected< / li >
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< / ul >
< / div >
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< div class = "section" id = "portability" >
< h1 > portability< / h1 >
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< p > libtorrent is portable at least among Windows, MacOS X and other UNIX-systems.
It uses Boost.Thread, Boost.Filesystem, Boost.Date_time and various other
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boost libraries as well as < a class = "reference external" href = "http://www.zlib.org" > zlib< / a > (shipped) and < a class = "reference external" href = "http://asio.sf.net" > asio< / a > (shipped). At least version
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1.33.1 of boost is required.< / p >
< p > Since libtorrent uses asio, it will take full advantage of high performance
network APIs on the most popular platforms. I/O completion ports on windows,
epoll on linux and kqueue on MacOS X and BSD.< / p >
< p > libtorrent has been successfully compiled and tested on:< / p >
< ul class = "simple" >
< li > Windows 2000 vc7.1, vc8< / li >
< li > Linux x86 GCC 3.3, GCC 3.4.2< / li >
< li > MacOS X (darwin), (Apple's) GCC 3.3, (Apple's) GCC 4.0< / li >
< li > SunOS 5.8 GCC 3.1< / li >
< li > Cygwin GCC 3.3.3< / li >
< / ul >
< p > Fails on:< / p >
< ul class = "simple" >
< li > GCC 2.95.4< / li >
< li > msvc6< / li >
< / ul >
< / div >
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< div class = "section" id = "license" >
< h1 > license< / h1 >
< p > libtorrent is released under the < a class = "reference external" href = "http://www.opensource.org/licenses/bsd-license.php" > BSD-license< / a > .< / p >
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< p > This means that you can use the library in your project without having to
release its source code. The only requirement is that you give credit
to the author of the library by including the libtorrent license in your
software or documentation.< / p >
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< p > < a class = "reference external" href = "projects.html" > Here's< / a > a list of some projects that uses libtorrent.< / p >
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