mirror of https://github.com/aria2/aria2
155 lines
5.7 KiB
Plaintext
155 lines
5.7 KiB
Plaintext
aria2 - The ultra fast download utility
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1. Disclaimer
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-------------
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This program comes with no warranty.
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You must use this program at your own risk.
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2. About aria2
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--------------
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aria2 has segmented downloading engine in its core. By segmented downloading,
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it can download files very much faster than ordinary browsers.
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aria2 is in very early development stage. Currently it has following features:
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* HTTP/HTTPS GET support
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* HTTP Proxy support
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* HTTP BASIC authentication support
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* HTTP Proxy authentication support
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* FTP support(active, passive mode)
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* FTP through HTTP proxy(GET command or tunneling)
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* Segmented download
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* Cookie support
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* It can load cookies from file whose format is used by Netscape and Mozilla.
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* It can run as a daemon process.
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* BitTorrent protocol support with fast extension.
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* Selective download in multi-file torrent/metalink.
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* Metalink version 3.0 support(HTTP/FTP/BitTorrent).
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* Limits download/upload speed.
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* Chunk checksum validation in Metalink.
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* netrc support.
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* Configuration file support.
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* Downloads URIs found in a text file or stdin.
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* Integrates HTTP/FTP/BitTorrent downloads; downloading a file from several
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different sources.
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3. Dependency
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-------------
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In order to enable HTTPS support, you need GNU TLS or OpenSSL.
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In order to enable BitTorrent support, you need GNU TLS+libgcrypt or OpenSSL.
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In order to enable Metalink support, you need libxml2 or Expat. Optionally
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GNU TLS+libgcrypt or OpenSSL are required for checksum checking support(MD5,
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SHA1, SHA256).
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Note;;
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GNU TLS has precedence over OpenSSL if both libraries are installed.
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If you prefer OpenSSL, run configure with "--without-gnutls".
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Note;;
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libxml2 has precedence over Expat if both libraries are installed.
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If you prefer Expat, run configure with "--without-libxml2".
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You can disable BitTorrent, Metalink support by providing --disable-bittorrent,
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--disable-metalink respectively to configure script.
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In order to enable async DNS support, you need c-ares or ares.
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c-ares: http://daniel.haxx.se/projects/c-ares/
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ares: ftp://athena-dist.mit.edu/pub/ATHENA/ares
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4. How to build
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---------------
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In order to build aria2 from the source package, you need following development
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packages(package name may vary depending on the distribution you use):
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* libgnutls-dev (Required for HTTPS, BitTorrent support)
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* libgpg-error-dev (Required for BitTorrent support)
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* libgcrypt-dev (Required for BitTorrent support)
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* libares-dev (Required for async DNS support)
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* libxml2-dev (Required for Metalink support)
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You can use libssl-dev instead of libgnutls-dev,libgpg-error-dev,libgcrypt-dev:
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* libssl-dev (Required for HTTPS, BitTorrent support)
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You can use libexpat1-dev instead of libxml2-dev:
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* libexpat1-dev (Required for Metalink support)
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The build process is fairly standard way for *nix programs:
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$ ./configure
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$ make
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The executable is aria2c in src directory.
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5. BitTorrrent
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--------------
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The filename of the downloaded file is determined as follows:
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single-file mode:
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If "name" key is present in .torrent file, filename is the value of "name"
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key. Otherwise, filename is the basename of .torrent file appended by
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".file". For example, .torrent file is "test.torrrent", then filename is
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"test.torrent.file".
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The directory to store the downloaded file can be specified by -d option.
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multi-file mode:
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The complete directory/file structure mentioned in .torrent file is
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created.
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The directory to store the top directory of downloaded files can be
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specified by -d option.
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In the default behavior, before download starts, complete directory structure
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is created if needed. Then aria2 opens all files mentioned in .torrent file,
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directly writes to and reads from these files.
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NOTE: Even in selective download, all files are opened.
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If "--direct-file-mapping" option set to be false, aria2 creates temporary
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file in the store directory. The length of this file is the sum of length of
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the files in .torrent file, so at least 2 times more disk space than the file
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size itself is required. Writing and reading is done against this file.
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After download completes, aria2 creates complete directory structure if needed,
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and copies whole file or a part of it to the destination.
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Note:
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* -o option is used to change the filename of downloaded .torrent file.
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* The ports aria2c uses are 6881-6999.
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* The maximum number of peers is 55. This limit may be exceeded when download
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rate is low.
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* As of release 0.10.0, aria2 stops sending request message after selective
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download completes,
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6. Metalink
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-----------
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The current implementation supports HTTP/FTP/BitTorrent.
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The other P2P protocols are ignored.
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For checksum checking, MD5, SHA1, SHA256 are supported. If multiple hash
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algorithms are provided, aria2 uses SHA1. If checksum checking is failed, aria2
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doesn't retry the download and just exits with non-zero return code.
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The supported user preferences are version, language, location, protocol and
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os.
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If chunk checksums are provided in Metalink file, aria2 automatically validate
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a chunk of file while downloading it. This behavior can be turned off by
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a command-line option.
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7. netrc
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--------
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netrc support is enabled by default in ftp.
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To disable netrc support, specify -n command-line option.
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Your .netrc file should have correct permissions(600).
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8. Configuration file
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---------------------
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Configuration file must be placed under ~/.aria2 and must be named as aria2.conf.
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In each line, there is 1 parameter whose syntax is name=value pair,
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where name is the long command-line option name without '--' prefix.
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The lines beginning '#' are treated as comments.
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Example:
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# sample configuration file for aria2c
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file-allocation=prealloc
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listen-port=60000
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seed-ratio=1.0
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max-upload-limit=40K
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ftp-pasv=true
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