NAME¶
gnunet-download - a command line interface for downloading files from GNUnet
SYNOPSIS¶
gnunet-download [
OPTIONS] -- GNUNET_URI
DESCRIPTION¶
Download files from GNUnet.
- -a LEVEL, --anonymity=LEVEL
- set desired level of receiver anonymity. Default is 1.
- -c FILENAME, --config=FILENAME
- use config file (defaults: ~/.config/gnunet.conf)
- -D, --delete-incomplete
- causes gnunet-download to delete incomplete downloads when aborted with
CTRL-C. Note that complete files that are part of an incomplete recursive
download will not be deleted even with this option. Without this option,
terminating gnunet-download with a signal will cause incomplete downloads
to stay on disk. If gnunet-download runs to (normal) completion finishing
the download, this option has no effect.
- -h, --help
- print help page
- -L LOGLEVEL, --loglevel=LOGLEVEL
- Change the loglevel. Possible values for LOGLEVEL are ERROR, WARNING, INFO
and DEBUG.
- -n, --no-network
- Only search locally, do not forward requests to other peers.
- -o FILENAME, --output=FILENAME
- write the file to FILENAME. Hint: when recursively downloading a
directory, append a '/' to the end of the FILENAME to create a directory
of that name. If no FILENAME is specified, gnunet-download constructs a
temporary ID from the URI of the file. The final filename is constructed
based on meta-data extracted using libextractor (if available).
- -p DOWNLOADS, --parallelism=DOWNLOADS
- set the maximum number of parallel downloads that is allowed. More
parallel downloads can, to some extent, improve the overall time to
download content. However, parallel downloads also take more memory (see
also option -r which can be used to limit memory utilization) and more
sockets. This option is used to limit the number of files that are
downloaded in parallel (-r can be used to limit the number of blocks that
are concurrently requested). As a result, the value only matters for
recursive downloads. The default value is 32.
- -r REQUESTS, --request-parallelism=REQUESTS
- set the maximum number of parallel requests that is allowed. If multiple
files are downloaded, gnunet-download will not run them in parallel if
this would cause the number of pending requests to possibly exceed the
given value. This is useful since, for example, downloading dozens of
multi-gigabyte files in parallel could exhaust memory resources and would
hardly improve performance. Note that the limit only applies to this
specific process and that other download activities by other processes are
not included in this limit. Consider raising this limit for large
recursive downloads with many large files if memory and network bandwidth
are not fully utilized and if the parallelism limit (-p option) is not
reached. This option also only matters for recursive downloads. The
default value is 4092.
- -R, --recursive
- download directories recursively (and in parallel); note that the URI must
belong to a GNUnet directory and that the filename given must end with a
'/' -- otherwise, only the file corresponding to the URI will be
downloaded. Note that in addition to using '-R', you must also specify a
filename ending in '.gnd' so that the code realizes that the top-level
file is a directory (since we have no meta data).
- -v, --version
- print the version number
- -V, --verbose
- print progress information
NOTES¶
The GNUNET_URI is typically obtained from gnunet-search. gnunet-fs-gtk can also
be used instead of gnunet-download. If you ever have to abort a download, you
can at any time continue it by re-issuing gnunet-download with the same
filename. In that case GNUnet will not download blocks again that are already
present. GNUnet's file-encoding will ensure file integrity, even if the
existing file was not downloaded from GNUnet in the first place. Temporary
information will be appended to the target file until the download is
completed.
SETTING ANONYMITY LEVEL¶
The
-a option can be used to specify additional anonymity constraints. If
set to 0, GNUnet will try to download the file as fast as possible, including
using non-anonymous methods. If you set it to 1 (default), you use the
standard anonymous routing algorithm (which does not explicitly leak your
identity). However, a powerful adversary may still be able to perform traffic
analysis (statistics) to over time infer data about your identity. You can
gain better privacy by specifying a higher level of anonymity, which increases
the amount of cover traffic your own traffic will get, at the expense of
performance. Note that your download performance is not only determined by
your own anonymity level, but also by the anonymity level of the peers
publishing the file. So even if you download with anonymity level 0, the peers
publishing the data might be sharing with a higher anonymity level, which in
this case will determine performance. Also, peers that cache content in the
network always use anonymity level 1.
This option can be used to limit requests further than that. In particular, you
can require GNUnet to receive certain amounts of traffic from other peers
before sending your queries. This way, you can gain very high levels of
anonymity - at the expense of much more traffic and much higher latency. So
set it only if you really believe you need it.
The definition of ANONYMITY-RECEIVE is the following. 0 means no anonymity is
required. Otherwise a value of 'v' means that 1 out of v bytes of
"anonymous" traffic can be from the local user, leaving 'v-1' bytes
of cover traffic per byte on the wire. Thus, if GNUnet routes n bytes of
messages from foreign peers (using anonymous routing), it may originate
n/(v-1) bytes of queries in the same time-period. The time-period is twice the
average delay that GNUnet defers forwarded queries.
The default is 1 and this should be fine for most users. Also notice that if you
choose very large values, you may end up having no throughput at all,
especially if many of your fellow GNUnet-peers all do the same.
FILES¶
- ~/.config/gnunet.conf
- GNUnet configuration file
REPORTING BUGS¶
Report bugs to <
https://gnunet.org/bugs/> or by sending electronic mail to
<gnunet-developers@gnu.org>
SEE ALSO¶
gnunet-fs-gtk(1),
gnunet-publish(1),
gnunet-search(1),
gnunet.conf(5),
gnunet-service-fs(1)