NAME¶

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

SYNOPSIS¶

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 gnunet-auto-share(1)). 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(1). 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(1). 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.

The options are as follows:

-a LEVEL | --anonymity=LEVEL

This option can be used to specify additional anonymity constraints. The default is 1. 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 (discovery via DHT and CADET 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 discovery your identity. You can gain better privacy by specifying a higher level of anonymity (using values above 1). This tells FS that it must hide your own requests in equivalent-looking cover traffic. This should confound an adversaries traffic analysis, increasing the time and effort it would take to discover your identity. However, it also can significantly reduce performance, as your requests will be delayed until sufficient cover traffic is available. The specific numeric value (for anonymity levels above 1) is simple: Given an anonymity level L (above 1), each request FS makes on your behalf must be hidden in L-1 equivalent requests of cover traffic (traffic your peer routes for others) in the same time-period. The time-period is twice the average delay by which GNUnet artificially delays traffic. Note that regardless of the anonymity level you choose, peers that cache content in the network always use anonymity level 1.

-c FILENAME | --config=FILENAME

Use alternate config file FILENAME. 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 | --enable-creation-time

Enable use of creation time timestamp in metadata. Setting this information will leak information about the time at which a file was made available.

-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 the help page.

-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, information for keyword search, namespace search and indexing data 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 identifier of a future version of the file to be published under the same pseudonym. 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, places the file into the namespace identified by the pseudonym NAME. NAME must be a valid pseudonym managed by gnunet-identity(1).

-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 identifier under which the file is to be published under a pseudonym. This option is only valid together with the -P 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.

EXAMPLES¶

FILES¶

~/.config/gnunet.conf GNUnet configuration file

SEE ALSO¶

extract(1), gnunet-auto-share(1), gnunet-download(1), gnunet-fs-gtk(1), gnunet-identity(1), gnunet-search(1), gnunet.conf(5)

The full documentation for gnunet is maintained as a Texinfo manual. If the info(1) and gnunet programs are properly installed at your site, the command

should give you access to the complete handbook,

will give you access to a tutorial for developers.

Depending on your installation, this information is also available in gnunet(7) and gnunet-c-tutorial(7).

BUGS¶

Report bugs by using https://bugs.gnunet.org or by sending electronic mail to <gnunet-developers@gnu.org>.