SYNOPSIS

aria2c [OPTIONS] [URI | MAGNET | TORRENT_FILE | METALINK_FILE]…

DESCRIPTION

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.

OPTIONS

Basic Options

-d, --dir=DIR

The directory to store the downloaded file.

-i, --input-file=FILE

Downloads URIs found in FILE. You can specify multiple URIs for a single entity: separate URIs on a single line using the TAB character. Reads input from stdin when - is specified. The additional out and dir options can be specified after each line of URIs. This optional line must start with white space(s). See Input File subsection for details.

-l, --log=LOG

The file name of the log file. If - is specified, log is written to stdout.

-j, --max-concurrent-downloads=N

Set maximum number of parallel downloads for every static (HTTP/FTP) URL, torrent and metalink. See also -s and -C option. Default: 5

-V, --check-integrity[=true|false]

Check file integrity by validating piece hashes. This option has effect only in BitTorrent and Metalink downloads with chunk checksums. Use this option to re-download a damaged portion of a file. Default: false

-c, --continue

Continue downloading a partially downloaded file. Use this option to resume a download started by a web browser or another program which downloads files sequentially from the beginning. Currently this option is only applicable to HTTP(S)/FTP downloads.

-h, --help[=TAG|KEYWORD]

The help messages are classified with tags. A tag starts with "#". For example, type "--help=#http" to get the usage for the options tagged with "#http". If non-tag word is given, print the usage for the options whose name includes that word. Available Values: #basic, #advanced, #http, #https, #ftp, #metalink, #bittorrent, #cookie, #hook, #file, #xml-rpc, #experimental, #all Default: #basic

HTTP/FTP Options

--all-proxy=PROXY

Use this proxy server for all protocols. To erase previously defined proxy, use "". You can override this setting and specify a proxy server for a particular protocol using --http-proxy, --https-proxy and --ftp-proxy options. This affects all URLs. The format of PROXY is [http://][USER:PASSWORD@]HOST[:PORT]

--connect-timeout=SEC

Set the connect timeout in seconds to establish connection to HTTP/FTP/proxy server. After the connection is established, this option makes no effect and --timeout option is used instead. Default: 60

--dry-run[=true|false]

If true is given, aria2 just checks whether the remote file is available and doesn’t download data. This option has effect on HTTP/FTP download. BitTorrent downloads are canceled if true is specified. Default: false

--lowest-speed-limit=SPEED

Close connection if download speed is lower than or equal to this value(bytes per sec). 0 means aria2 does not have a lowest speed limit. You can append K or M(1K = 1024, 1M = 1024K). This option does not affect BitTorrent downloads. Default: 0

--max-file-not-found=NUM

If aria2 receives ‘file not found’ status from the remote HTTP/FTP servers NUM times without getting a single byte, then force the download to fail. Specify 0 to disable this option. This options is effective only when using HTTP/FTP servers. Default: 0

-m, --max-tries=N

Set number of tries. 0 means unlimited. Default: 5

-n, --no-netrc

Disables netrc support. netrc support is enabled by default.

--no-proxy=DOMAINS

Specify comma separated hostnames or domains where proxy should not be used.

-o, --out=FILE

The file name of the downloaded file. When -Z option is used, this option is ignored.

Note
 In Metalink or BitTorrent download you cannot specify file name. The file name specified here is only used when the URLs fed to aria2 are done by command line without -i, -Z option. For example: aria2c -o myfile.zip "http://mirror1/file.zip" "http://mirror2/file.zip"
--proxy-method=METHOD

Set the method to use in proxy request. METHOD is either get or tunnel. HTTPS downloads always use tunnel regardless of this option. Default: get

-R, --remote-time[=true|false]

Retrieve timestamp of the remote file from the remote HTTP/FTP server and if it is available, apply it to the local file. Default: false

--server-stat-of=FILE

Specify the filename to which performance profile of the servers is saved. You can load saved data using --server-stat-if option. See Server Performance Profile subsection below for file format.

--server-stat-if=FILE

Specify the filename to load performance profile of the servers. The loaded data will be used in some URI selector such as feedback. See also --uri-selector option. See Server Performance Profile subsection below for file format.

--server-stat-timeout=SEC

Specifies timeout in seconds to invalidate performance profile of the servers since the last contact to them. Default: 86400 (24hours)

-s, --split=N

Download a file using N connections. If more than N URLs are given, first N URLs are used and remaining URLs are used for backup. If less than N URLs are given, those URLs are used more than once so that N connections total are made simultaneously. Please see -j option too. Please note that in Metalink download, this option has no effect and use -C option instead. Default: 5

-t, --timeout=SEC

Set timeout in seconds. Default: 60

--uri-selector=SELECTOR

Specify URI selection algorithm. The possible values are inorder, feedback and adaptive. If inorder is given, URI is tried in the order appeared in the URI list. If feedback is given, aria2 uses download speed observed in the previous downloads and choose fastest server in the URI list. This also effectively skips dead mirrors. The observed download speed is a part of performance profile of servers mentioned in --server-stat-of and --server-stat-if options. If adaptive is given, selects one of the best mirrors for the first and reserved connections. For supplementary ones, it returns mirrors which has not been tested yet, and if each of them has already been tested, returns mirrors which has to be tested again. Otherwise, it doesn’t select anymore mirrors. Like feedback, it uses a performance profile of servers. Default: feedback

HTTP Specific Options

--ca-certificate=FILE

Use the certificate authorities in FILE to verify the peers. The certificate file must be in PEM format and can contain multiple CA certificates. Use --check-certificate option to enable verification.

--certificate=FILE

Use the client certificate in FILE. The certificate must be in PEM format. You may use --private-key option to specify the private key.

--check-certificate[=true|false]

Verify the peer using certificates specified in --ca-certificate option. Default: true

--http-auth-challenge[=true|false]

Send HTTP authorization header only when it is requested by the server. If false is set, then authorization header is always sent to the server. There is an exception: if username and password are embedded in URI, authorization header is always sent to the server regardless of this option. Default: false

--http-no-cache[=true|false]

Send Cache-Control: no-cache and Pragma: no-cache header to avoid cached content. If false is given, these headers are not sent and you can add Cache-Control header with a directive you like using --header option. Default: true

--http-user=USER

Set HTTP user. This affects all URLs.

--http-passwd=PASSWD

Set HTTP password. This affects all URLs.

--http-proxy=PROXY

Use this proxy server for HTTP. To erase previously defined proxy, use "". See also --all-proxy option. This affects all URLs. The format of PROXY is [http://][USER:PASSWORD@]HOST[:PORT]

--https-proxy=PROXY

Use this proxy server for HTTPS. To erase previously defined proxy, use "". See also --all-proxy option. This affects all URLs. The format of PROXY is [http://][USER:PASSWORD@]HOST[:PORT]

--private-key=FILE

Use the private key in FILE. The private key must be decrypted and in PEM format. The behavior when encrypted one is given is undefined. See also --certificate option.

--referer=REFERER

Set Referer. This affects all URLs.

--enable-http-keep-alive[=true|false]

Enable HTTP/1.1 persistent connection. Default: true

--enable-http-pipelining[=true|false]

Enable HTTP/1.1 pipelining. Default: false

--header=HEADER

Append HEADER to HTTP request header. You can use this option repeatedly to specify more than one header: aria2c --header="X-A: b78" --header="X-B: 9J1" "http://host/file"

--load-cookies=FILE

Load Cookies from FILE using the Firefox3 format (SQLite3) and the Mozilla/Firefox(1.x/2.x)/Netscape format.

Note
 If aria2 is built without libsqlite3, then it doesn’t support Firefox3 cookie format.
--save-cookies=FILE

Save Cookies to FILE in Mozilla/Firefox(1.x/2.x)/ Netscape format. If FILE already exists, it is overwritten. Session Cookies are also saved and their expiry values are treated as 0. Possible Values: /path/to/file

--use-head[=true|false]

Use HEAD method for the first request to the HTTP server. Default: false

-U, --user-agent=USER_AGENT

Set user agent for HTTP(S) downloads. Default: aria2/$VERSION, $VERSION is replaced by package version.

FTP Specific Options

--ftp-user=USER

Set FTP user. This affects all URLs. Default: anonymous

--ftp-passwd=PASSWD

Set FTP password. This affects all URLs. If user name is embedded but password is missing in URI, aria2 tries to resolve password using .netrc. If password is found in .netrc, then use it as password. If not, use the password specified in this option. Default: ARIA2USER@

-p, --ftp-pasv[=true|false]

Use the passive mode in FTP. If false is given, the active mode will be used. Default: true

--ftp-proxy=PROXY

Use this proxy server for FTP. To erase previously defined proxy, use "". See also --all-proxy option. This affects all URLs. The format of PROXY is [http://][USER:PASSWORD@]HOST[:PORT]

--ftp-type=TYPE

Set FTP transfer type. TYPE is either binary or ascii. Default: binary

--ftp-reuse-connection[=true|false]

Reuse connection in FTP. Default: true

BitTorrent/Metalink Options

--select-file=INDEX…

Set file to download by specifying its index. You can find the file index using the --show-files option. Multiple indexes can be specified by using ",", for example: 3,6. You can also use "-" to specify a range: 1-5. "," and "-" can be used together: 1-5,8,9. When used with the -M option, index may vary depending on the query (see --metalink-* options).

Note
 In multi file torrent, the adjacent files specified by this option may also be downloaded. This is by design, not a bug. A single piece may include several files or part of files, and aria2 writes the piece to the appropriate files.
-S, --show-files

Print file listing of .torrent or .metalink file and exit. In case of .torrent file, additional information (infohash, piece length, etc) is also printed.

BitTorrent Specific Options

--bt-external-ip=IPADDRESS

Specify the external IP address to report to a BitTorrent tracker. Although this function is named "external", it can accept any kind of IP addresses. IPADDRESS must be a numeric IP address.

--bt-hash-check-seed[=true|false]

If true is given, after hash check using --check-integrity option and file is complete, continue to seed file. If you want to check file and download it only when it is damaged or incomplete, set this option to false. This option has effect only on BitTorrent download. Default: true

--bt-max-open-files=NUM

Specify maximum number of files to open in each BitTorrent download. Default: 100

--bt-max-peers=NUM

Specify the maximum number of peers per torrent. 0 means unlimited. See also --bt-request-peer-speed-limit option. Default: 55

--bt-metadata-only[=true|false]

Download metadata only. The file(s) described in metadata will not be downloaded. This option has effect only when BitTorrent Magnet URI is used. See also --bt-save-metadata option. Default: false

--bt-min-crypto-level=plain|arc4

Set minimum level of encryption method. If several encryption methods are provided by a peer, aria2 chooses the lowest one which satisfies the given level. Default: plain

--bt-prioritize-piece=head[=SIZE],tail[=SIZE]

Try to download first and last pieces of each file first. This is useful for previewing files. The argument can contain 2 keywords: head and tail. To include both keywords, they must be separated by comma. These keywords can take one parameter, SIZE. For example, if head=SIZE is specified, pieces in the range of first SIZE bytes of each file get higher priority. tail=SIZE means the range of last SIZE bytes of each file. SIZE can include K or M(1K = 1024, 1M = 1024K). If SIZE is omitted, SIZE=1M is used.

--bt-require-crypto=true|false

If true is given, aria2 doesn’t accept and establish connection with legacy BitTorrent handshake(\19BitTorrent protocol). Thus aria2 always uses Obfuscation handshake. Default: false

--bt-request-peer-speed-limit=SPEED

If the whole download speed of every torrent is lower than SPEED, aria2 temporarily increases the number of peers to try for more download speed. Configuring this option with your preferred download speed can increase your download speed in some cases. You can append K or M(1K = 1024, 1M = 1024K). Default: 50K

--bt-save-metadata[=true|false]

Save metadata as .torrent file. This option has effect only when BitTorrent Magnet URI is used. The filename is hex encoded info hash with suffix .torrent. The directory to be saved is the same directory where download file is saved. If the same file already exists, metadata is not saved. See also --bt-metadata-only option. Default: false

--bt-seed-unverified[=true|false]

Seed previously downloaded files without verifying piece hashes. Default: false

--bt-stop-timeout=SEC

Stop BitTorrent download if download speed is 0 in consecutive SEC seconds. If 0 is given, this feature is disabled. Default: 0

--bt-tracker-interval=SEC

Set the interval in seconds between tracker requests. This completely overrides interval value and aria2 just uses this value and ignores the min interval and interval value in the response of tracker. If 0 is set, aria2 determines interval based on the response of tracker and the download progress. Default: 0

--dht-entry-point=HOST:PORT

Set host and port as an entry point to DHT network.

--dht-file-path=PATH

Change the DHT routing table file to PATH. Default: $HOME/.aria2/dht.dat

--dht-listen-port=PORT…

Set UDP listening port for DHT. Multiple ports can be specified by using ",", for example: 6881,6885. You can also use "-" to specify a range: 6881-6999. "," and "-" can be used together. Default: 6881-6999

Note
 Make sure that the specified ports are open for incoming UDP traffic.
--enable-dht[=true|false]

Enable DHT functionality. If a private flag is set in a torrent, aria2 doesn’t use DHT for that download even if true is given. Default: true

--enable-peer-exchange[=true|false]

Enable Peer Exchange extension. If a private flag is set in a torrent, this feature is disabled for that download even if true is given. Default: true

--follow-torrent=true|false|mem

If true or mem is specified, when a file whose suffix is ".torrent" or content type is "application/x-bittorrent" is downloaded, aria2 parses it as a torrent file and downloads files mentioned in it. If mem is specified, a torrent file is not written to the disk, but is just kept in memory. If false is specified, the action mentioned above is not taken. Default: true

-O, --index-out=INDEX=PATH

Set file path for file with index=INDEX. You can find the file index using the --show-files option. PATH is a relative path to the path specified in --dir option. You can use this option multiple times. Using this option, you can specify the output filenames of BitTorrent downloads.

--listen-port=PORT…

Set TCP port number for BitTorrent downloads. Multiple ports can be specified by using ",", for example: 6881,6885. You can also use "-" to specify a range: 6881-6999. "," and "-" can be used together: 6881-6889,6999. Default: 6881-6999

Note
 Make sure that the specified ports are open for incoming TCP traffic.
--max-overall-upload-limit=SPEED

Set max overall upload speed in bytes/sec. 0 means unrestricted. You can append K or M(1K = 1024, 1M = 1024K). To limit the upload speed per torrent, use --max-upload-limit option. Default: 0

-u, --max-upload-limit=SPEED

Set max upload speed per each torrent in bytes/sec. 0 means unrestricted. You can append K or M(1K = 1024, 1M = 1024K). To limit the overall upload speed, use --max-overall-upload-limit option. Default: 0

--peer-id-prefix=PEER_ID_PREFIX

Specify the prefix of peer ID. The peer ID in BitTorrent is 20 byte length. If more than 20 bytes are specified, only first 20 bytes are used. If less than 20 bytes are specified, random byte data are added to make its length 20 bytes. Default: aria2/$VERSION-, $VERSION is replaced by package version.

--seed-ratio=RATIO

Specify share ratio. Seed completed torrents until share ratio reaches RATIO. You are strongly encouraged to specify equals or more than 1.0 here. Specify 0.0 if you intend to do seeding regardless of share ratio. If --seed-time option is specified along with this option, seeding ends when at least one of the conditions is satisfied. Default: 1.0

--seed-time=MINUTES

Specify seeding time in minutes. Also see the --seed-ratio option.

-T, --torrent-file=TORRENT_FILE

The path to the .torrent file. You are not required to use this option because you can specify .torrent files without -T.

Metalink Specific Options

--follow-metalink=true|false|mem

If true or mem is specified, when a file whose suffix is ".metalink" or content type of "application/metalink+xml" is downloaded, aria2 parses it as a metalink file and downloads files mentioned in it. If mem is specified, a metalink file is not written to the disk, but is just kept in memory. If false is specified, the action mentioned above is not taken. Default: true

-M, --metalink-file=METALINK_FILE

The file path to .metalink file. Reads input from stdin when - is specified. You are not required to use this option because you can specify .metalink files without -M.

-C, --metalink-servers=NUM_SERVERS

The number of servers to connect to simultaneously. Some Metalinks regulate the number of servers to connect. aria2 strictly respects them. This means that if Metalink defines the maxconnections attribute lower than NUM_SERVERS, then aria2 uses the value of maxconnections attribute instead of NUM_SERVERS. See also -s and -j options. Default: 5

--metalink-language=LANGUAGE

The language of the file to download.

--metalink-location=LOCATION[,…]

The location of the preferred server. A comma-delimited list of locations is acceptable, for example, JP,US.

--metalink-os=OS

The operating system of the file to download.

--metalink-version=VERSION

The version of the file to download.

--metalink-preferred-protocol=PROTO

Specify preferred protocol. The possible values are http, https, ftp and none. Specify none to disable this feature. Default: none

--metalink-enable-unique-protocol=true|false

If true is given and several protocols are available for a mirror in a metalink file, aria2 uses one of them. Use --metalink-preferred-protocol option to specify the preference of protocol. Default: true

XML-RPC Options

--enable-xml-rpc[=true|false]

Enable XML-RPC server. It is strongly recommended to set username and password using --xml-rpc-user and --xml-rpc-passwd option. See also --xml-rpc-listen-port option. Default: false

--xml-rpc-listen-all[=true|false]

Listen incoming XML-RPC requests on all network interfaces. If false is given, listen only on local loopback interface. Default: false

--xml-rpc-listen-port=PORT

Specify a port number for XML-RPC server to listen to. Possible Values: 1024-65535 Default: 6800

--xml-rpc-max-request-size=SIZE

Set max size of XML-RPC request. If aria2 detects the request is more than SIZE bytes, it drops connection. Default: 2M

--xml-rpc-passwd=PASSWD

Set XML-RPC password.

--xml-rpc-user=USER

Set XML-RPC user.

Advanced Options

--allow-overwrite=true|false

Restart download from scratch if the corresponding control file doesn’t exist. See also --auto-file-renaming option. Default: false

--allow-piece-length-change=true|false

If false is given, aria2 aborts download when a piece length is different from one in a control file. If true is given, you can proceed but some download progress will be lost. Default: false

--async-dns[=true|false]

Enable asynchronous DNS. Default: true

--auto-file-renaming[=true|false]

Rename file name if the same file already exists. This option works only in HTTP(S)/FTP download. The new file name has a dot and a number(1..9999) appended. Default: true

--auto-save-interval=SEC

Save a control file(*.aria2) every SEC seconds. If 0 is given, a control file is not saved during download. aria2 saves a control file when it stops regardless of the value. The possible values are between 0 to 600. Default: 60

--conf-path=PATH

Change the configuration file path to PATH. Default: $HOME/.aria2/aria2.conf

-D, --daemon

Run as daemon. The current working directory will be changed to / and standard input, standard output and standard error will be redirected to /dev/null. Default: false

--disable-ipv6[=true|false]

Disable IPv6. This is useful if you have to use broken DNS and want to avoid terribly slow AAAA record lookup. Default: false

--enable-direct-io[=true|false]

Enable directI/O, which lowers cpu usage while allocating/checking files. Turn off if you encounter any error. Default: true

--event-poll=POLL

Specify the method for polling events. The possible Values are epoll and select. If you use recent Linux that has epoll, then the default value is epoll. Otherwise, the default value is select.

--file-allocation=METHOD

Specify file allocation method. none doesn’t pre-allocate file space. prealloc pre-allocates file space before download begins. This may take some time depending on the size of the file. If you are using newer file systems such as ext4 (with extents support), btrfs or xfs, falloc is your best choice. It allocates large(few GiB) files almost instantly. Don’t use falloc with legacy file systems such as ext3 because it takes almost same time as prealloc and it blocks aria2 entirely until allocation finishes. falloc may not be available if your system doesn’t have posix_fallocate() function. Possible Values: none, prealloc, falloc Default: prealloc

--human-readable[=true|false]

Print sizes and speed in human readable format (e.g., 1.2Ki, 3.4Mi) in the console readout. Default: true

--interface=INTERFACE

Bind sockets to given interface. You can specify interface name, IP address and hostname. Possible Values: interface, IP address, hostname

Note
 If an interface has multiple addresses, it is highly recommended to specify IP address explicitly. See also --disable-ipv6. If your system doesn’t have getifaddrs(), this option doesn’t accept interface name.
--log-level=LEVEL

Set log level to output. LEVEL is either debug, info, notice, warn or error. Default: debug

--on-download-complete=COMMAND

Set the command to be executed when download completes. See --on-download-start option for the requirement of COMMAND. See also --on-download-stop option. Possible Values: /path/to/command

--on-download-error=COMMAND

Set the command to be executed when download aborts due to error. See --on-download-start option for the requirement of COMMAND. See also --on-download-stop option. Possible Values: /path/to/command

--on-download-start=COMMAND

Set the command to be executed when download starts up. COMMAND must take just one argument and GID is passed to COMMAND as a first argument. Possible Values: /path/to/command

--on-download-stop=COMMAND

Set the command to be executed when download stops. You can override the command to be executed for particular download result using --on-download-complete and --on-download-error. If they are specified, command specified in this option is not executed. See --on-download-start option for the requirement of COMMAND. Possible Values: /path/to/command

--summary-interval=SEC

Set interval in seconds to output download progress summary. Setting 0 suppresses the output. Default: 60

Note
 In multi file torrent downloads, the files adjacent forward to the specified files are also allocated if they share the same piece.
-Z, --force-sequential[=true|false]

Fetch URIs in the command-line sequentially and download each URI in a separate session, like the usual command-line download utilities. Default: false

--max-overall-download-limit=SPEED

Set max overall download speed in bytes/sec. 0 means unrestricted. You can append K or M(1K = 1024, 1M = 1024K). To limit the download speed per download, use --max-download-limit option. Default: 0

--max-download-limit=SPEED

Set max download speed per each download in bytes/sec. 0 means unrestricted. You can append K or M(1K = 1024, 1M = 1024K). To limit the overall download speed, use --max-overall-download-limit option. Default: 0

--no-conf

Disable loading aria2.conf file.

--no-file-allocation-limit=SIZE

No file allocation is made for files whose size is smaller than SIZE. You can append K or M(1K = 1024, 1M = 1024K). Default: 5M

-P, --parameterized-uri[=true|false]

Enable parameterized URI support. You can specify set of parts: http://{sv1,sv2,sv3}/foo.iso. Also you can specify numeric sequences with step counter: http://host/image[000-100:2].img. A step counter can be omitted. If all URIs do not point to the same file, such as the second example above, -Z option is required. Default: false

-q, --quiet[=true|false]

Make aria2 quiet (no console output). Default: false

--realtime-chunk-checksum=true|false

Validate chunk of data by calculating checksum while downloading a file if chunk checksums are provided. Default: true

--stop=SEC

Stop application after SEC seconds has passed. If 0 is given, this feature is disabled. Default: 0

-v, --version

Print the version number, copyright and the configuration information and exit.

Options That Take An Optional Argument

The options that have its argument surrounded by square brackets([]) take an optional argument. Usually omiting the argument is evaluated to true. If you use short form of these options(such as -V) and give an argument, then the option name and its argument should be concatenated(e.g. -Vfalse). If any spaces are inserted between the option name and the argument, the argument will be treated as URI and usually this is not what you expect.

URI, MAGNET, TORRENT_FILE, METALINK_FILE

You can specify multiple URLs in command-line. Unless you specify -Z option, all URLs must point to the same file or downloading will fail.

You can specify arbitrary number of BitTorrent Magnet URI. Please note that they are always treated as a separate download. Both hex encoded 40 characters Info Hash and Base32 encoded 32 characters Info Hash are supported. The multiple "tr" parameters are supported. Because BitTorrent Magnet URI is likely to contain "&" character, it is highly recommended to always quote URI with single(') or double(") quotation. It is strongly recommended to enable DHT especially when "tr" parameter is missing. See http://www.bittorrent.org/beps/bep_0009.html for more details about BitTorrent Magnet URI.

You can also specify arbitrary number of torrent files and metalink files stored on a local drive. Please note that they are always treated as a separate download.

You can specify both torrent file with -T option and URLs. By doing this, you can download a file from both torrent swarm and HTTP(S)/FTP server at the same time, while the data from HTTP(S)/FTP are uploaded to the torrent swarm. For single file torrents, URL can be a complete URL pointing to the resource or if URL ends with /, name in torrent file in torrent is added. For multi-file torrents, name and path are added to form a URL for each file.

Note
 Make sure that URL is quoted with single(') or double(") quotation if it contains "&" or any characters that have special meaning in shell.

Resuming Download

Usually, you can resume transfer by just issuing same command(aria2c URL) if the previous transfer is made by aria2.

If the previous transfer is made by a browser or wget like sequential download manager, then use -c option to continue the transfer(aria2c -c URL).

EXIT STATUS

Because aria2 can handle multiple downloads at once, it encounters lots of errors in a session. aria2 returns the following exit status based on the last error encountered.

0

If all downloads are successful.

1

If an unknown error occurs.

2

If time out occurs.

3

If a resource is not found.

4

If aria2 sees the specfied number of "resource not found" error. See --max-file-not-found option).

5

If a download aborts because download speed is too slow. See --lowest-speed-limit option)

6

If network problem occurs.

7

If there are unfinished downloads. This error is only reported if all finished downloads are successful and there are unfinished downloads in a queue when aria2 exits by pressing Ctrl-C by an user or sending TERM or INT signal.

Note
 An error occurred in a finished download will not be reported as exit status.

ENVIRONMENT

aria2 recognizes the following environment variables.

http_proxy [http://][USER:PASSWORD@]HOST[:PORT]

Specify proxy server for use in HTTP. Overrides http-proxy value in configuration file. The command-line option --http-proxy overrides this value.

https_proxy [http://][USER:PASSWORD@]HOST[:PORT]

Specify proxy server for use in HTTPS. Overrides https-proxy value in configuration file. The command-line option --https-proxy overrides this value.

ftp_proxy [http://][USER:PASSWORD@]HOST[:PORT]

Specify proxy server for use in FTP. Overrides ftp-proxy value in configuration file. The command-line option --ftp-proxy overrides this value.

all_proxy [http://][USER:PASSWORD@]HOST[:PORT]

Specify proxy server for use if no protocol-specific proxy is specified. Overrides all-proxy value in configuration file. The command-line option --all-proxy overrides this value.

no_proxy [DOMAIN,…]

Specify comma-separated hostname or domains to which proxy should not be used. Overrides no-proxy value in configuration file. The command-line option --no-proxy overrides this value.

FILES

aria2.conf

By default, aria2 parses $HOME/.aria2/aria2.conf as a configuraiton file. You can specify the path to configuration file using --conf-path option. If you don’t want to use the configuraitonf file, use --no-conf option.

The configuration file is a text file and has 1 option per each line. In each line, you can specify name-value pair in the format: NAME=VALUE, where name is the long command-line option name without "--" prefix. You can use same syntax for the command-line option. The lines beginning "#" are treated as comments.

# sample configuration file for aria2c
listen-port=60000
dht-listen-port=60000
seed-ratio=1.0
max-upload-limit=50K
ftp-pasv=true

dht.dat

By default, the routing table of DHT is saved to the path $HOME/.aria2/dht.dat.

Control File

aria2 uses a control file to track the progress of a download. A control file is placed in the same directory as the downloading file and its filename is the filename of downloading file with ".aria2" appended. For example, if you are downloading file.zip, then the control file should be file.zip.aria2. (There is a exception for this naming convention. If you are downloading a multi torrent, its control file is the "top directory" name of the torrent with ".aria2" appended. The "top directory" name is a value of "name" key in "info" directory in a torrent file.)

Usually a control file is deleted once download completed. If aria2 decides that download cannot be resumed(for example, when downloading a file from a HTTP server which doesn’t support resume), a control file is not created.

Normally if you lose a control file, you cannot resume download. But if you have a torrent or metalink with chunk checksums for the file, you can resume the download without a control file by giving -V option to aria2c in command-line.

Input File

The input file can contain a list of URIs for aria2 to download. You can specify multiple URIs for a single entity: separate URIs on a single line using the TAB character.

Each line is treated as if it is provided in command-line argument. Therefore they are affected by -Z and -P options.

Additionally, the following options can be specified after each line of URIs. These optional lines must start with white space(s).

  • dir

  • check-integrity

  • continue

  • all-proxy

  • connect-timeout

  • dry-run

  • lowest-speed-limit

  • max-file-not-found

  • max-tries

  • no-proxy

  • out

  • proxy-method

  • remote-time

  • split

  • timeout

  • http-auth-challenge

  • http-no-cache

  • http-user

  • http-passwd

  • http-proxy

  • https-proxy

  • referer

  • enable-http-keep-alive

  • enable-http-pipelining

  • header

  • use-head

  • user-agent

  • ftp-user

  • ftp-passwd

  • ftp-pasv

  • ftp-proxy

  • ftp-type

  • ftp-reuse-connection

  • no-netrc

  • select-file

  • bt-external-ip

  • bt-hash-check-seed

  • bt-max-open-files

  • bt-max-peers

  • bt-metadata-only

  • bt-min-crypto-level

  • bt-prioritize-piece

  • bt-require-crypto

  • bt-request-peer-speed-limit

  • bt-save-metadata

  • bt-seed-unverified

  • bt-stop-timeout

  • bt-tracker-interval

  • enable-peer-exchange

  • follow-torrent

  • index-out

  • max-upload-limit

  • seed-ratio

  • seed-time

  • follow-metalink

  • metalink-servers

  • metalink-language

  • metalink-location

  • metalink-os

  • metalink-version

  • metalink-preferred-protocol

  • metalink-enable-unique-protocol

  • allow-overwrite

  • allow-piece-length-change

  • async-dns

  • auto-file-renaming

  • file-allocation

  • max-download-limit

  • no-file-allocation-limit

  • parameterized-uri

  • realtime-chunk-checksum

These options have exactly same meaning of the ones in the command-line options, but it just applies to the URIs it belongs to.

For example, the content of uri.txt is

http://server/file.iso http://mirror/file.iso
  dir=/iso_images
  out=file.img
http://foo/bar

If aria2 is executed with -i uri.txt -d /tmp options, then file.iso is saved as /iso_images/file.img and it is downloaded from http://server/file.iso and http://mirror/file.iso. The file bar is downloaded from http://foo/bar and saved as /tmp/bar.

In some cases, out parameter has no effect. See note of --out option for the restrictions.

Server Performance Profile

This section describes the format of server performance profile. The file is plain text and each line has several NAME=VALUE pair, delimited by comma. Currently following NAMEs are recognized:

host

Hostname of the server. Required.

protocol

Protocol for this profile, such as ftp, http. Required.

dl_speed

The average download speed observed in the previous download in bytes per sec. Required.

sc_avg_speed

The average download speed observed in the previous download in bytes per sec. This value is only updated if the download is done in single connection environment and only used by AdaptiveURISelector. Optional.

mc_avg_speed

The average download speed observed in the previous download in bytes per sec. This value is only updated if the download is done in multi connection environment and only used by AdaptiveURISelector. Optional.

counter

How many times the server is used. Currently this value is only used by AdaptiveURISelector. Optional.

last_updated

Last contact time in GMT with this server, specified in the seconds since the Epoch(00:00:00 on January 1, 1970, UTC). Required.

status

ERROR is set when server cannot be reached or out-of-service or timeout occurred. Otherwise, OK is set.

Those fields must exist in one line. The order of the fields is not significant. You can put pairs other than the above; they are simply ignored.

An example follows:

host=localhost, protocol=http, dl_speed=32000, last_updated=1222491640, status=OK
host=localhost, protocol=ftp, dl_speed=0, last_updated=1222491632, status=ERROR

XML-RPC INTERFACE

Terminology

GID

GID(or gid) is the key to manage each download. Each download has an unique GID. Currently GID looks like an integer, but don’t treat it as integer because it may be changed to another type in the future release. Please note that GID is session local and not persisted when aria2 exits.

Methods

aria2.addUri uris[, options[, position]]

This method adds new HTTP(S)/FTP/BitTorrent Magnet URI. uris is of type array and its element is URI which is of type string. For BitTorrent Magnet URI, uris must have only one element and it should be BitTorrent Magnet URI. options is of type struct and its members are a pair of option name and value. See Options below for more details. If position is given as an integer starting from 0, the new download is inserted at position in the waiting queue. If position is not given or position is larger than the size of the queue, it is appended at the end of the queue. This method returns GID of registered download.

aria2.addTorrent torrent[, uris[, options[, position]]]

This method adds BitTorrent download by uploading .torrent file. If you want to add BitTorrent Magnet URI, use aria2.addUri method instead. torrent is of type base64 which contains Base64-encoded .torrent file. uris is of type array and its element is URI which is of type string. uris is used for Web-seeding. For single file torrents, URI can be a complete URI pointing to the resource or if URI ends with /, name in torrent file is added. For multi-file torrents, name and path in torrent are added to form a URI for each file. options is of type struct and its members are a pair of option name and value. See Options below for more details. If position is given as an integer starting from 0, the new download is inserted at position in the waiting queue. If position is not given or position is larger than the size of the queue, it is appended at the end of the queue. This method returns GID of registered download.

aria2.addMetalink metalink[, options[, position]]

This method adds Metalink download by uploading .metalink file. metalink is of type base64 which contains Base64-encoded .metalink file. options is of type struct and its members are a pair of option name and value. See Options below for more details. If position is given as an integer starting from 0, the new download is inserted at position in the waiting queue. If position is not given or position is larger than the size of the queue, it is appended at the end of the queue. This method returns array of GID of registered download.

aria2.remove gid

This method removes the download denoted by gid. gid is of type string. If specified download is in progress, it is stopped at first. The status of removed download becomes "removed". This method returns GID of removed download.

aria2.tellStatus gid

This method returns download progress of the download denoted by gid. gid is of type string. The response is of type struct and it contains following keys. The value type is string.

gid

GID of this download.

status

"active" for currently downloading/seeding entry. "waiting" for the entry in the queue; download is not started. "error" for the stopped download because of error. "complete" for the stopped and completed download. "removed" for the download removed by user.

totalLength

Total length of this download in bytes.

completedLength

Completed length of this download in bytes.

uploadLength

Uploaded length of this download in bytes.

bitfield

Hexadecimal representation of the download progress. The highest bit corresponds to piece index 0. The set bits indicate the piece is available and unset bits indicate the piece is missing. The spare bits at the end are set to zero.

downloadSpeed

Download speed of this download measured in bytes/sec.

uploadSpeed

Upload speed of this download measured in bytes/sec.

infoHash

InfoHash. BitTorrent only.

numSeeders

The number of seeders the client has connected to. BitTorrent only.

pieceLength

Piece length in bytes.

numPieces

The number of pieces.

connections

The number of peers/servers the client has connected to.

errorCode

The last error code occurred in this download. The value is of type string. The error codes are defined in EXIT STATUS section. This value is only available for stopped/completed downloads.

followedBy

List of GIDs which are generated by the consequence of this download. For example, when aria2 downloaded Metalink file, it generates downloads described in it(see --follow-metalink option). This value is useful to track these auto generated downloads. If there is no such downloads, this key will not be included in the response.

belongsTo

GID of a parent download. Some downloads are a part of another download. For example, if a file in Metalink has BitTorrent resource, the download of .torrent is a part of that file. If this download has no parent, this key will not be included in the response.

dir

Directory to save files. This key is not available for stopped downloads.

files

Returns the list of files. The element of list is the same struct used in aria2.getFiles method.

bittorrent

Struct which contains information retrieved from .torrent file. BitTorrent only. It contains following keys.

announceList

List of lists of announce URI. If .torrent file contains announce and no announce-list, announce is converted to announce-list format.

comment

The comment for the torrent. comment.utf-8 is used if available.

creationDate

The creation time of the torrent. The value is an integer since the Epoch, measured in seconds.

mode

File mode of the torrent. The value is either single or multi.

info

Struct which contains data from Info dictionary. It contains following keys.

name

name in info dictionary. name.utf-8 is used if available.

aria2.getUris gid

This method returns URIs used in the download denoted by gid. gid is of type string. The response is of type array and its element is of type struct and it contains following keys. The value type is string.

uri

URI

aria2.getFiles gid

This method returns file list of the download denoted by gid. gid is of type string. The response is of type array and its element is of type struct and it contains following keys. The value type is string.

index

Index of file. Starting with 1. This is the same order with the files in multi-file torrent.

path

File path.

length

File size in bytes.

selected

"true" if this file is selected by --select-file option. If --select-file is not specified or this is single torrent or no torrent download, this value is always "true". Otherwise "false".

uris

Returns the list of URI for this file. The element of list is the same struct used in aria2.getUris method.

aria2.getPeers gid

This method returns peer list of the download denoted by gid. gid is of type string. This method is for BitTorrent only. The response is of type array and its element is of type struct and it contains following keys. The value type is string.

peerId

Percent-encoded peer ID.

ip

IP address of the peer.

port

Port number of the peer.

bitfield

Hexadecimal representation of the download progress of the peer. The highest bit corresponds to piece index 0. The set bits indicate the piece is available and unset bits indicate the piece is missing. The spare bits at the end are set to zero.

amChoking

"true" if this client is choking the peer. Otherwise "false".

peerChoking

"true" if the peer is choking this client. Otherwise "false".

downloadSpeed

Download speed (byte/sec) that this client obtains from the peer.

uploadSpeed

Upload speed(byte/sec) that this client uploads to the peer.

seeder

"true" is this client is a seeder. Otherwise "false".

aria2.tellActive

This method returns the list of active downloads. The response is of type array and its element is the same struct returned by aria2.tellStatus method.

aria2.tellWaiting offset, num

This method returns the list of waiting download. offset is of type integer and specifies the offset from the download waiting at the front. num is of type integer and specifies the number of downloads to be returned.

If offset is a positive integer, this method returns downloads in the range of [offset, offset+num).

offset can be a negative integer. offset == -1 points last download in the waiting queue and offset == -2 points the download before the last download, and so on. The downloads in the response are in reversed order.

For example, imagine that three downloads "A","B" and "C" are waiting in this order. aria2.tellWaiting(0, 1) returns ["A"]. aria2.tellWaiting(1, 2) returns ["B", "C"]. aria2.tellWaiting(-1, 2) returns ["C", "B"].

The response is of type array and its element is the same struct returned by aria2.tellStatus method.

aria2.tellStopped offset, num

This method returns the list of stopped download. offset is of type integer and specifies the offset from the oldest download. num is of type integer and specifies the number of downloads to be returned.

offset and num have the same semantics as aria2.tellWaiting method.

The response is of type array and its element is the same struct returned by aria2.tellStatus method.

aria2.changePosition gid, pos, how

This method changes the position of the download denoted by gid. pos is of type integer. how is of type string. If how is "POS_SET", it moves the download to a position relative to the beginning of the queue. If how is "POS_CUR", it moves the download to a position relative to the current position. If how is "POS_END", it moves the download to a position relative to the end of the queue. If the destination position is less than 0 or beyond the end of the queue, it moves the download to the beginning or the end of the queue respectively. The response is of type integer and it is the destination position.

For example, if GID#1 is placed in position 3, aria2.changePosition(1, -1, POS_CUR) will change its position to 2. Additional aria2.changePosition(1, 0, POS_SET) will change its position to 0(the beginning of the queue).

aria2.getOption gid

This method returns options of the download denoted by gid. The response is of type struct. Its key is the name of option. The value type is string.

aria2.changeOption gid, options

This method changes options of the download denoted by gid dynamically. gid is of type string. options is of type struct and the available options are: bt-max-peers, bt-request-peer-speed-limit, max-download-limit and max-upload-limit. This method returns "OK" for success.

aria2.getGlobalOption

This method returns global options. The response is of type struct. Its key is the name of option. The value type is string. Because global options are used as a template for the options of newly added download, the response contains keys returned by aria2.getOption method.

aria2.changeGlobalOption options

This method changes global options dynamically. options is of type struct and the available options are max-concurrent-downloads, max-overall-download-limit and max-overall-upload-limit. This method returns "OK" for success.

aria2.purgeDownloadResult

This method purges completed/error/removed downloads to free memory. This method returns "OK".

aria2.getVersion

This method returns version of the program and the list of enabled features. The response is of type struct and contains following keys.

version

Version number of the program in string.

enabledFeatures

List of enabled features. Each feature name is of type string.

aria2.getSessionInfo

This method returns session information. The response is of type struct and contains following key.

sessionId

Session ID, which is generated each time when aria2 is invoked.

system.multicall methods

This methods encapsulates multiple method calls in a single request. methods is of type array and its element is struct. The struct contains two keys: "methodName" and "params". "methodName" is the method name to call and "params" is array containing parameters to the method. This method returns array of responses. The element of array will either be a one-item array containing the return value of each method call or struct of fault element if an encapsulated method call fails.

Error Handling

In case of error, aria2 returns faultCode=1 and the error message in faultString.

Options

Same options for -i list are available. See Input File subsection for complete list of options.

In the option struct, name element is option name(without preceding "--") and value element is argument as string.

<struct>
  <member>
    <name>split</name>
    <value><string>1</string></value>
  </member>
  <member>
    <name>http-proxy</name>
    <value><string>http://proxy/</string></value>
  </member>
</struct>

header and index-out option are allowed multiple times in command-line. Since name should be unique in struct(many XML-RPC library implementation uses hash or dict for struct), single string is not enough. To overcome this situation, they can take array as value as well as string.

<struct>
  <member>
    <name>header</name>
    <value>
      <array>
        <data>
          <value><string>Accept-Language: ja</string></value>
          <value><string>Accept-Charset: utf-8</string></value>
        </data>
      </array>
    </value>
  </member>
</struct>

Sample XML-RPC Client Code

The following Ruby script adds http://localhost/aria2.tar.bz2 to aria2c operated on localhost with option --dir=/downloads and prints its reponse.

#!/usr/bin/env ruby

require 'xmlrpc/client'
require 'pp'

client=XMLRPC::Client.new2("http://localhost:6800/rpc")

options={ "dir" => "/downloads" }
result=client.call("aria2.addUri", [ "http://localhost/aria2.tar.bz2" ], options)

pp result

If you are a Python lover, you can use xmlrpclib(for Python3.x, use xmlrpc.client instead) to interact with aria2.

import xmlrpclib
from pprint import pprint

s = xmlrpclib.ServerProxy("http://localhost:6800/rpc")
r = s.aria2.addUri(["http://localhost/aria2.tar.bz2"], {"dir":"/downloads"})
pprint(r)

EXAMPLE

HTTP/FTP Segmented Download

Download a file

aria2c "http://host/file.zip"
Note
 aria2 uses 5 connections to download 1 file by default.

Download a file using 1 connection

aria2c -s1 "http://host/file.zip"
Note
 aria2 uses 5 connections to download 1 file by default. -s1 limits the number of connections to just 1.
Note
 To pause a download, press Ctrl-C. You can resume the transfer by running aria2c with the same argument in the same directory. You can change URLs as long as they are pointing to the same file.

Download a file from 2 different HTTP servers

aria2c "http://host/file.zip" "http://mirror/file.zip"

Download a file from HTTP and FTP servers

aria2c "http://host1/file.zip" "ftp://host2/file.zip"

Download files listed in a text file concurrently

aria2c -ifiles.txt -j2
Note
 -j option specifies the number of parallel downloads.

Using proxy

For HTTP:

aria2c --http-proxy="http://proxy:8080" "http://host/file"

For FTP:

aria2c --ftp-proxy="http://proxy:8080" "ftp://host/file"
Note
 See --http-proxy, --https-proxy, --ftp-proxy and --all-proxy for details. You can specify proxy in the environment variables. See ENVIRONMENT section.

Proxy with authorization

aria2c --http-proxy="http://username:password@proxy:8080" "http://host/file"

Metalink Download

Download files with remote Metalink

aria2c --follow-metalink=mem "http://host/file.metalink"

Download using a local metalink file

aria2c -p --lowest-speed-limit=4000 file.metalink
Note
 To pause a download, press Ctrl-C. You can resume the transfer by running aria2c with the same argument in the same directory.

Download several local metalink files

aria2c -j2 file1.metalink file2.metalink

Download only selected files using index

aria2c --select-file=1-4,8 file.metalink
Note
 The index is printed to the console using -S option.

Download a file using a local .metalink file with user preference

aria2c --metalink-location=JP,US --metalink-version=1.1 --metalink-language=en-US file.metalink

BitTorrent Download

Download files from remote BitTorrent file

aria2c --follow-torrent=mem "http://host/file.torrent"

Download using a local torrent file

aria2c --max-upload-limit=40K file.torrent
Note
 --max-upload-limit specifies the max of upload rate.
Note
 To pause a download, press Ctrl-C. You can resume the transfer by running aria2c with the same argument in the same directory.

Download using BitTorrent Magnet URI

aria2c "magnet:?xt=urn:btih:248D0A1CD08284299DE78D5C1ED359BB46717D8C&dn=aria2"
Note
 Don’t forget to quote BitTorrent Magnet URI which includes "&" character with single(') or double(") quotation.

Download 2 torrents

aria2c -j2 file1.torrent file2.torrent

Download a file using torrent and HTTP/FTP server

aria2c -Ttest.torrent "http://host1/file" "ftp://host2/file"
Note
 Downloading multi file torrent with HTTP/FTP is not supported.

Download only selected files using index(usually called "selectable download")

aria2c --select-file=1-4,8 file.torrent
Note
 The index is printed to the console using -S option.

Specify output filename

To specify output filename for BitTorrent downloads, you need to know the index of file in torrent file using -S option. For example, the output looks like this:

idx|path/length
===+======================
  1|dist/base-2.6.18.iso
   |99.9MiB
---+----------------------
  2|dist/driver-2.6.18.iso
   |169.0MiB
---+----------------------

To save dist/base-2.6.18.iso in /tmp/mydir/base.iso and dist/driver-2.6.18.iso in /tmp/dir/driver.iso, use the following command:

aria2c --dir=/tmp --index-out=1=mydir/base.iso --index-out=2=dir/driver.iso file.torrent

Change the listening port for incoming peer

aria2c --listen-port=7000-7001,8000 file.torrent
Note
 Since aria2 doesn’t configure firewall or router for port forwarding, it’s up to you to do it manually.

Specify the condition to stop program after torrent download finished

aria2c --seed-time=120 --seed-ratio=1.0 file.torrent
Note
 In the above example, the program exits when the 120 minutes has elapsed since download completed or seed ratio reaches 1.0.

Throttle upload speed

aria2c --max-upload-limit=100K file.torrent

Enable DHT

aria2c --enable-dht --dht-listen-port=6881 file.torrent
Note
 DHT uses udp port. Since aria2 doesn’t configure firewall or router for port forwarding, it’s up to you to do it manually.

More advanced HTTP features

Load cookies

aria2c --load-cookies=cookies.txt "http://host/file.zip"
Note
 You can use Firefox/Mozilla’s cookie file without modification.

Resume download started by web browsers or another programs

aria2c -c -s2 "http://host/partiallydownloadedfile.zip"

Client certificate authorization for SSL/TLS

aria2c --certificate=/path/to/mycert.pem --private-key=/path/to/mykey.pem https://host/file
Note
 The file specified in --private-key must be decrypted. The behavior when encrypted one is given is undefined.

Verify peer in SSL/TLS using given CA certificates

aria2c --ca-certificate=/path/to/ca-certificates.crt --check-certificate https://host/file

And more advanced features

Throttle download speed

aria2c --max-download-limit=100K file.metalink

Repair a damaged download

aria2c -V file.metalink
Note
 This option is only available used with BitTorrent or metalink with chunk checksums.

Drop connection if download speed is lower than specified value

aria2c --lowest-speed-limit=10K file.metalink

Parameterized URI support

You can specify set of parts:

aria2c -P "http://{host1,host2,host3}/file.iso"

You can specify numeric sequence:

aria2c -Z -P "http://host/image[000-100].png"
Note
 -Z option is required if the all URIs don’t point to the same file, such as the above example.

You can specify step counter:

aria2c -Z -P "http://host/image[A-Z:2].png"

Parallel downloads of arbitrary number of URL,metalink,torrent

aria2c -j3 -Z "http://host/file1" file2.torrent file3.metalink

BitTorrent Encryption

Encrypt whole payload using ARC4:

aria2c --bt-min-crypto-level=arc4 --bt-require-crypto=true file.torrent

SEE ALSO

Project Web Site: http://aria2.sourceforge.net/

aria2 Wiki: http://sourceforge.net/apps/trac/aria2/wiki

Metalink Homepage: http://www.metalinker.org/

COPYRIGHT

Copyright © 2006, 2010 Tatsuhiro Tsujikawa

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

In addition, as a special exception, the copyright holders give permission to link the code of portions of this program with the OpenSSL library under certain conditions as described in each individual source file, and distribute linked combinations including the two. You must obey the GNU General Public License in all respects for all of the code used other than OpenSSL. If you modify file(s) with this exception, you may extend this exception to your version of the file(s), but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. If you delete this exception statement from all source files in the program, then also delete it here.