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Man Pages


Manual Reference Pages  -  GNUNET-PUBLISH (1)

NAME

gnunet-publish - a command line interface for publishing new content into GNUnet

CONTENTS

Synopsis
Description
Setting Anonymity Level
Examples
Files

SYNOPSIS

gnunet-publish [OPTIONS] FILENAME

DESCRIPTION

In order to share files with other GNUnet users, the files must first be made available to GNUnet. GNUnet does not automatically share all files from a certain directory (however, you can do this with the gnunet-auto-share tool). In fact, even files that are downloaded are not automatically shared.

In order to start sharing files, the files must be added either using gnunet-publish or a graphical interface such as gnunet-fs-gtk. The command line tool gnunet-publish is more useful if many files are supposed to be added. gnunet-publish can automatically publish batches of files, recursively publish directories, create directories that can be browsed within GNUnet and publish file lists in a namespace. When run on a directory, gnunet-publish will always recursively publish all of the files in the directory.

gnunet-publish can automatically extract keywords from the files that are shared. Users that want to download files from GNUnet use keywords to search for the appropriate content. You can disable keyword extraction with the -D option. You can manually add keywords using the -k option. The keywords are case-sensitive.

In addition to searching for files by keyword, GNUnet allows organizing files into directories. With directories, the user only needs to find the directory in order to be able to download any of the files listed in the directory. Directories can contain pointers to other directories.

With gnunet-publish, it is easy to create new directories simultaneously when adding the files. Simply pass the name of a directory instead of a file.

Since keywords can be spammed (any user can add any content under any keyword), GNUnet supports namespaces. A namespace is a subset of the searchspace into which only the holder of a certain pseudonym can add content. Any GNUnet user can create any number of pseudonyms using gnunet-pseudonym. Pseudonyms are stored in the user’s GNUnet directory. While pseudonyms are locally identified with an arbitrary string that the user selects when the pseudonym is created, the namespace is globally known only under the hash of the public key of the pseudonym. Since only the owner of the pseudonym can add content to the namespace, it is impossible for other users to pollute the namespace. gnunet-publish automatically publishes the top-directory (or the only file if only one file is specified) into the namespace if a pseudonym is specified.

It is possible to update content in GNUnet if that content was placed and obtained from a particular namespace. Updates are only possible for content in namespaces since this is the only way to assure that a malicious party can not supply counterfeited updates. Note that an update with GNUnet does not make the old content unavailable, GNUnet merely allows the publisher to point users to more recent versions. You can use the -N option to specify the future identifier of an update. When using this option, a GNUnet client that finds the current (-t) identifier will automatically begin a search for the update (-N) identifier. If you later publish an update under the (-N) identifier, both results will be given to the user.

You can use automatic meta-data extraction (based on libextractor) or the command-line option -m to specify meta-data. For the -m option you need to use the form keyword-type:value. For example, use "-m os:Linux" to specify that the operating system is Linux. Common meta-data types are "author", "title" , "mimetype", "filename", "language", "subject" and "keywords". A full list can be obtained from the extract tool using the option --list. The meta-data is used to help users in searching for files on the network. The keywords are case-sensitive.

GNUnet supports two styles of publishing files on the network. Publishing a file means that a copy of the file is made in the local (!) database of the node. Indexing a file means that an index is added to the local (!) database with symbolic links to the file itself. The links will use the SHA-512 hash of the entire file as the filename. Indexing is generally significantly more efficient and the default choice. However, indexing only works if the indexed file can be read (using the same absolute path) by gnunet-service-fs. If this is not the case, indexing will fail (and gnunet-publish will automatically revert to publishing instead). Regardless of which method is used to publish the file, the file will be slowly (depending on how often it is requested and on how much bandwidth is available) dispersed into the network. If you publish or index a file and then leave the network, it will almost always NOT be available anymore.

-c FILENAME, --config=FILENAME Use alternate config file (if this option is not specified, the default is ~/.config/gnunet.conf).

-D, --disable-extractor
  Disable use of GNU libextractor for finding additional keywords and metadata.

-e, --extract
  Print the list of keywords that will be used for each file given the current options. Do not perform any indexing or publishing.

-h, --help Print a brief help page with all the options.

-k KEYWORD, --key=KEYWORD
  additional key to index the content with (to add multiple keys, specify multiple times). Each additional key is case-sensitive. Can be specified multiple times. The keyword is only applied to the top-level file or directory.

-L LOGLEVEL, --loglevel=LOGLEVEL
  Change the loglevel. Possible values for LOGLEVEL are ERROR, WARNING, INFO and DEBUG.

-m TYPE:VALUE, --meta=TYPE:VALUE
  For the main file (or directory), set the metadata of the given TYPE to the given VALUE. Note that this will not add the respective VALUE to the set of keywords under which the file can be found.

-n, --noindex
  Executive summary: You probably don’t need it.

Do not index, full publishing. Note that directories, RBlocks, SBlocks and IBlocks are always published (even without this option). With this option, every block of the actual files is stored in encrypted form in the block database of the local peer. While this adds security if the local node is compromised (the adversary snags your machine), it is significantly less efficient compared to on-demand encryption and is definitely not recommended for large files.

-N ID, --next=ID
  Specifies the next ID of a future version of the SBlock. This option is only valid together with the -P option. This option can be used to specify what the identifier of an updated version will look like. Note that specifying -i and -N without -t is not allowed.

-p PRIORITY, --prio=PRIORITY
  Executive summary: You probably don’t need it.

Set the priority of the published content (default: 365). If the local database is full, GNUnet will discard the content with the lowest ranking. Note that ranks change over time depending on popularity. The default should be high enough to preserve the locally published content in favor of content that migrates from other peers.

-P NAME, --pseudonym=NAME
  For the top-level directory or file, create an SBlock that places the file into the namespace specified by the pseudonym NAME.

-r LEVEL, --replication=LEVEL
  Set the desired replication level. If CONTENT_PUSHING is set to YES, GNUnet will push each block (for the file) LEVEL times to other peers before doing normal "random" replication of all content. This option can be used to push some content out into the network harder. Note that pushing content LEVEL times into the network does not guarantee that there will actually be LEVEL replicas.

-s, --simulate-only
  When this option is used, gnunet-publish will not actually publish the file but just simulate what would be done. This can be used to compute the GNUnet URI for a file without actually sharing it.

-t ID, --this=ID
  Specifies the ID of the SBlock. This option is only valid together with the -s option.

-u URI, --uri=URI
  This option can be used to specify the URI of a file instead of a filename (this is the only case where the otherwise mandatory filename argument must be omitted). Instead of publishing a file or directory and using the corresponding URI, gnunet-publish will use this URI and perform the selected namespace or keyword operations. This can be used to add additional keywords to a file that has already been shared or to add files to a namespace for which the URI is known but the content is not locally available.

-v, --version
  Print the version number.

-V, --verbose
  Be verbose. Using this option causes gnunet-publish to print progress information and at the end the file identification that can be used to download the file from GNUnet.

SETTING ANONYMITY LEVEL

The -a option can be used to specify additional anonymity constraints. If set to 0, GNUnet will publish the file non-anonymously and in fact sign the advertisement for the file using your peer’s private key. This will allow other users to download the file as fast as possible, including using non-anonymous methods (DHT, direct transfer). 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 regardless of the anonymity level you choose, peers that cache content in the network always use anonymity level 1.

The definition of the ANONYMITY LEVEL 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 data 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.

EXAMPLES

Basic examples

Index a file COPYING:

# gnunet-publish COPYING

Publish a file COPYING:

# gnunet-publish -n COPYING

Index a file COPYING with the keywords gpl and test:

# gnunet-publish -k gpl -k test COPYING

Index a file COPYING with description "GNU License", mime-type "text/plain" and keywords gpl and test:

# gnunet-publish -m "description:GNU License" -k gpl -k test -m "mimetype:text/plain" COPYING

Using directories

Index the files COPYING and AUTHORS with keyword test and build a directory containing the two files. Make the directory itself available under keyword gnu and disable keyword extraction using libextractor:

# mkdir gnu
# mv COPYING AUTHORS gnu/
# gnunet-publish -K test -k gnu -D gnu/

Neatly publish an image gallery in kittendir/ and its subdirs with keyword kittens for the directory but no keywords for the individual files or subdirs (-n). Force description for all files:

# gnunet-publish -n -m "description:Kitten collection" -k kittens kittendir/

Secure publishing with namespaces

Publish file COPYING with pseudonym RIAA-2 (-P) and with identifier gpl (-t) and no updates:

# gnunet-publish -P RIAA-2 -t gpl COPYING

Recursively index /home/ogg and build a matching directory structure. Publish the top-level directory into the namespace under the pseudonym RIAA-2 (-P) under identifier ’MUSIC’ (-t) and promise to provide an update with identifier ’VIDEOS’ (-N):

# gnunet-publish -P RIAA-2 -t MUSIC -N VIDEOS /home/ogg

Recursively publish (-n) /var/lib/mysql and build a matching directory structure, but disable the use of libextractor to extract keywords (-n). Print the file identifiers (-V) that can be used to retrieve the files. This will store a copy of the MySQL database in GNUnet but without adding any keywords to search for it. Thus only people that have been told the secret file identifiers printed with the -V option can retrieve the (secret?) files:

# gnunet-publish -nV /var/lib/mysql

Create a namespace entry ’root’ in namespace MPAA-1 and announce that the next update will be called ’next’:

# gnunet-publish -P MPAA-1 -t root -N next noise.mp3

Update the previous entry, do not allow any future updates:

# gnunet-publish -P MPAA-1 -t next noise_updated.mp3

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-auto-share(1), gnunet-fs-gtk(1), gnunet-search(1), gnunet-download(1), gnunet.conf(5), extract(1)
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GNUnet GNUNET-PUBLISH (1) 25 Feb 2012

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