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aria2 is a lightweight multi-protocol & multi-source, cross platform download utility operated in command-line. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink.
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README

aria2 - The ultra fast download utility
=======================================
:Author:    Tatsuhiro Tsujikawa
:Email:     tujikawa_at_users_dot_sourceforge_dot_net

Disclaimer
----------
This program comes with no warranty.
You must use this program at your own risk.

Introduction
------------
aria2 is a utility for downloading files. The supported protocols are
HTTP(S), FTP, BitTorrent, and Metalink. aria2 can download a file from
multiple sources/protocols and tries to utilize your maximum download
bandwidth. It supports downloading a file from HTTP(S)/FTP and
BitTorrent at the same time, while the data downloaded from
HTTP(S)/FTP is uploaded to the BitTorrent swarm. Using Metalink's
chunk checksums, aria2 automatically validates chunks of data while
downloading a file like BitTorrent.

Here is a list of features.

* Command-line interface
* Download files through HTTP(S)/FTP/BitTorrent
* Segmented downloading
* Metalink version 3.0 support(HTTP/FTP/BitTorrent)
* HTTP/1.1 implementation
* HTTP Proxy support
* HTTP BASIC authentication support
* HTTP Proxy authentication support
* Well-known environment variables for proxy: http_proxy, https_proxy,
  ftp_proxy, all_proxy and no_proxy
* HTTP gzip, deflate content encoding support
* Verify peer using given trusted CA certificate in HTTPS
* Client certificate authentication in HTTPS
* Chunked transfer encoding support
* Load Cookies from file using the Firefox3 format and the Mozilla/Firefox
  (1.x/2.x)/Netscape format.
* Save Cookies in the Mozilla/Firefox (1.x/2.x)/Netscape format.
* Custom HTTP Header support
* Persistent Connections support
* FTP through HTTP Proxy
* Download/Upload speed throttling
* BitTorrent extensions: Fast extension, DHT, PEX, MSE/PSE, Multi-Tracker
* BitTorrent http://getright.com/seedtorrent.html[WEB-Seeding]. aria2
  requests chunks more than piece size to reduce the request
  overhead. It also supports pipelined requests with piece size.
* Rename/change the directory structure of BitTorrent downloads
  completely
* XML-RPC interface
* Run as a daemon process
* Selective download in multi-file torrent/Metalink
* Chunk checksum validation in Metalink
* Can disable segmented downloading in Metalink
* Netrc support
* Configuration file support
* Download URIs found in a text file or stdin and the destination directory and
  output filename can be specified optionally
* Parameterized URI support

Dependency
----------

.External Library Dependency
[options="header"]
|=================================================
|features             |dependency
|HTTPS                |GnuTLS or OpenSSL
|BitTorrent           |GnuTLS+Libgcrypt or OpenSSL
|Metalink             |libxml2 or Expat.
|Checksum             |GnuTLS+Libgcrypt or OpenSSL
|gzip, deflate in HTTP|zlib
|Async DNS            |C-Ares
|Firefox3 cookie      |libsqlite3
|XML-RPC              |libxml2 or Expat.
|=================================================

Note;;
  GNU TLS has precedence over OpenSSL if both libraries are installed.
  If you prefer OpenSSL, run configure with \--without-gnutls.

Note;;
  libxml2 has precedence over Expat if both libraries are installed.
  If you prefer Expat, run configure with \--without-libxml2.

You can disable BitTorrent, Metalink support by providing
\--disable-bittorrent, \--disable-metalink respectively to configure
script.

In order to enable async DNS support, you need c-ares.

* c-ares: http://daniel.haxx.se/projects/c-ares/

How to build
------------
In order to build aria2 from the source package, you need following
development packages(package name may vary depending on the
distribution you use):

* libgnutls-dev    (Required for HTTPS, BitTorrent, Checksum support)
* libgpg-error-dev (Required for BitTorrent, Checksum support)
* libgcrypt-dev    (Required for BitTorrent, Checksum support)
* libc-ares-dev    (Required for async DNS support)
* libxml2-dev      (Required for Metalink support)
* libz1g-dev       (Required for gzip, deflate decoding support in HTTP)
* libsqlite3-dev   (Required for Firefox3 cookie support)

You can use libssl-dev instead of
libgnutls-dev,libgpg-error-dev,libgcrypt-dev:

* libssl-dev       (Required for HTTPS, BitTorrent, Checksum support)

You can use libexpat1-dev instead of libxml2-dev:

* libexpat1-dev    (Required for Metalink support)

The quickest way to build aria2 is just type following commands:

-------------
$ ./configure
$ make
-------------

The configure script checks available libraries and enables the features
as much as possible because all the features are enabled by default.

Since 1.1.0, aria2 checks the certificate of HTTPS servers by default.
If you build with HTTPS support, I recommend to supply the path to the
CA bundle file. For example, in Debian the path to CA bundle file is
'/etc/ssl/certs/ca-certificates.crt' (in ca-certificates package). This
may vary depending on your distribution. You can give it to
configure script using \--with-ca-bundle option:

-------------------------------------------------------------------
$ ./configure --with-ca-bundle='/etc/ssl/certs/ca-certificates.crt'
$ make
-------------------------------------------------------------------

Without \--with-ca-bundle option, you will encounter the error when
accessing HTTPS servers because the certificate cannot be verified
without CA bundle. In such case, you can specify the CA bundle file
using aria2's \--ca-certificate option.  If you don't have CA bundle
file installed, then the last resort is disable the certificate
validation using \--check-certificate=false.

The executable is 'aria2c' in src directory.

aria2 uses CppUnit for automated unit testing. To run the unit test:

------------
$ make check
------------

BitTorrrent
-----------
About filename
~~~~~~~~~~~~~~
The filename of the downloaded file is determined as follows:

single-file mode::
    If "name" key is present in .torrent file, filename is the value
    of "name" key. Otherwise, filename is the basename of .torrent
    file appended by ".file". For example, .torrent file is
    "test.torrrent", then filename is "test.torrent.file".  The
    directory to store the downloaded file can be specified by -d
    option.

multi-file mode::
    The complete directory/file structure mentioned in .torrent file
    is created.  The directory to store the top directory of
    downloaded files can be specified by -d option.

Before download starts, a complete directory structure is created if
needed. By default, aria2 opens at most 100 files mentioned in
.torrent file, and directly writes to and reads from these files. 
The number of files to open simultaneously can be controlled by
\--bt-max-open-files option.

DHT
~~~
As of release 0.13.0, aria2 supports DHT. By default, the routing
table is saved to $HOME/.aria2/dht.dat.

Other things should be noted
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* -o option is used to change the filename of .torrent file itself,
  not a filename of a file in .torrent file.
* The port numbers that aria2 uses by default are 6881-6999 for TCP
  and UDP.
* aria2 doesn't configure port-forwarding automatically. Please
  configure your router or firewall manually.
* The maximum number of peers is 55. This limit may be exceeded when
  download rate is low. This download rate can be adjusted using
  \--bt-request-peer-speed-limit option.
* As of release 0.10.0, aria2 stops sending request message after
  selective download completes.

Metalink
--------
The current implementation supports HTTP(S)/FTP/BitTorrent.  The other
P2P protocols are ignored.

For checksum verification, MD5, SHA1, and SHA256 are supported. If 
multiple hash algorithms are provided, aria2 uses SHA1. If whole file
checksum verification fails, aria2 doesn't retry the download and just 
exits with non-zero return code.

The supported user preferences are version, language, location,
protocol and os.

If chunk checksums are provided in Metalink file, aria2 automatically
validates chunks of data during download. This behavior can be turned
off by a command-line option.

If signature is included in a Metalink file, aria2 saves it as a file
after the completion of the download.  The filename is download
filename + ".sig". If same file already exists, the signature file is
not saved.

netrc
-----
netrc support is enabled by default for HTTP(S)/FTP.  To disable netrc
support, specify -n command-line option.  Your .netrc file should have
correct permissions(600).

References
----------
 * man aria2c
 * http://aria2.sourceforge.net/
 * http://sourceforge.net/apps/trac/aria2/wiki
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