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                       Welcome to GNUnet


What is GNUnet?
===============

GNUnet is peer-to-peer framework focusing on security.  The first and
primary application for GNUnet is anonymous file-sharing.  GNUnet is
currently developed by a worldwide group of independent free software
developers.  GNUnet is a GNU package (http://www.gnu.org/).

This is an ALPHA release.  There are known and significant bugs as 
well as many missing features in this release.  

Additional documentation about GNUnet can be found at
https://gnunet.org/.


Dependencies:
=============

Please note that for many of its dependencies GNUnet requires very
recent versions of the libraries which are often NOT to be found in
stable distributions in 2010.  While using older packages may in some
cases on some operating systems may seem to work in some limited
fashion, we are in many cases aware of serious problems with older
packages.  Hence please make sure to use  the versions listed below.

These are the direct dependencies for running GNUnet:

- libextractor  >= 0.6.1
- libmicrohttpd >= 0.9.2
- libgcrypt     >= 1.2
- libcurl       >= 7.21.0
- libltdl       >= 2.2 (part of GNU libtool)
- sqlite        >= 3.0 (default database)
- mysql         >= 5.1 (alternative to sqLite)
- postgres      >= 8.3 (alternative to sqLite)

Recommended autotools for compiling the SVN version are:
- autoconf >= 2.59
- automake >= 1.11.1
- libtool  >= 2.2 


How to install?
===============

The fastest way is to use a binary package if it is available for your
system.  For a more detailed description, read the installation
instructions on the webpage at https://gnunet.org/installation.

Note that some functions of GNUnet require "root" access.  GNUnet will
install (tiny) SUID binaries for those functions is you run "make
install" as root.  If you do not, GNUnet will still work, but some
functionality will not be available (including certain forms of NAT
traversal).

GNUnet requires the GNU MP library (http://www.gnu.org/software/gmp/)
and libgcrypt (http://www.gnupg.org/).  You can specify the path to
libgcrypt by passing "--with-gcrypt=PATH" to configure.  You will also
need either sqlite (http://www.sqlite.org/), MySQL
(http://www.mysql.org/) or PostGres (http://www.postgres.org/).

If you install from source, you need to install GNU libextractor first
(download from http://www.gnu.org/software/libextractor/).  We also
recommend installing GNU libmicrohttpd (download from
http://www.gnu.org/software/libmicrohttpd/).  Then you can start the
actual GNUnet compilation process with:

$ ./configure --prefix=$HOME --with-extractor=$HOME
$ make
# make install
# sudo -u gnunet mkdir ~/.gnunet/ 
# sudo -u gnunet touch ~/.gnunet/gnunet.conf
# sudo -u gnunet gnunet-arm -s

This will compile and install GNUnet to $HOME/bin/, $HOME/lib/ and
$HOME/share/ and start the system with the default configuration.  It
is recommended that you add a user "gnunet" to run "gnunet-arm".  You
can then still run the end-user applications as another user.  If you
create a user "gnunet", it is recommended that you edit the
configuration file slightly so that data can be stored in
"/var/lib/gnunet"; you may also want to use "/etc/gnunet.conf" for the
location of the configuration file in this case.

Note that additional, per-user configuration files
(~/.gnunet/gnunet.conf) need to be created by each user (for example,
by running gnunet-setup).  Note that gnunet-setup is a separate
download and requires GTK+; you can also edit the configuration file
by hand, but this is not recommended.  For more general information
about the GNU build process read the INSTALL file.

If you are compiling the code from subversion, you have to run
". bootstrap" before ./configure.  If you receive an error during the
running of ". bootstrap" that looks like "macro `AM_PATH_GTK' not
found in library", you may need to run aclocal by hand with the -I
option, pointing to your aclocal m4 macros, i.e.

$ aclocal -I /usr/local/share/aclocal


Configuration
=============

GNUnet uses two types of configuration files, one that specifies the
system-wide defaults (typically located in /usr/share/gnunet/defaults
.conf) and a second one that overrides default values with
user-specific preferences.  The user-specific configuration file
should be located in "~/.gnunet/gnunet.conf" or its location can be
specified by giving the "-c" option to the respective GNUnet
application.

The defaults that are shipped with the installation are usually ok,
you may want to adjust the limitations (space consumption, bandwidth,
etc.) though.  The configuration files are human-readable.  Note that
you MUST create "~/.gnunet/gnunet.conf" explicitly before starting
GNUnet.  You can either copy "defaults.conf" or simply create an empty
file.


Usage
=====

First, you must obtain an initial list of GNUnet hosts.  Knowing a
single peer is sufficient since after that GNUnet propagates
information about other peers.  Note that the default "gnunet.conf"
contains URLs from where GNUnet downloads an initial hostlist
whenever it is started.  If you want to create an alternative URL for
others to use, the file can be generated on any machine running
GNUnet by periodically executing

$ cat $SERVICEHOME/data/hosts/* > the_file

and offering 'the_file' via your web server.  Alternatively, you can
run the build-in web server by adding '-p' to the OPTIONS value
in the "hostlist" section of gnunet.conf and opening the respective
HTTPPORT to the public.

If the solution with the hostlist URL is not feasible for your
situation, you can also add hosts manually.  Simply copy the hostkeys
to "$SERVICEHOME/data/hosts/" (where $SERVICEHOME is the directory
specified in the gnunet.conf configuration file).

Now start the local node using "gnunet-arm -s".  GNUnet should run 24/7 if
you want to maximize your anonymity.  

The GTK user interface is shipped separately.  After downloading and
installing gnunet-gtk, you can invoke the GUI with:

$ gnunet-gtk

// FIXME: gnunet-qt is not yet supported in 0.9.x
For Qt/KDE users, there is also a QT user interface (also shipped 
separately).  If you install gnunet-qt, you can invoke the GUI with:

$ gnunet-qt

If you want to use the shell (part of this distribution), use

$ gnunet-search KEYWORD

This will display a list of results to the console. Then use

$ gnunet-download -o FILENAME GNUNET_URI

to retrieve a file.  The GNUNET_URI is printed by gnunet-search
together with a description.  To publish files on GNUnet, use the
"gnunet-publish" command.

// FIXME: auto-share is not yet supported in 0.9.x
In order to share files, the easiest way is to create a directory
with the files (and directories) that you want to share and run

$ nohup gnunet-auto-share NAME-OF-THE-DIRECTORY &

For further documentation, see our webpage.


Hacking GNUnet
==============

Contributions are welcome, please submit bugs to
https://gnunet.org/bugs/.  Please make sure to run contrib/report.sh
and include the output with your bug reports.  More about how to
report bugs can be found in the GNUnet FAQ on the webpage.  Submit
patches via E-Mail to gnunet-developers@gnu.org.

In order to run the unit tests with "make check", you need to
set an environment variable ("GNUNET_PREFIX") to the directory
where GNUnet is installed (usually, GNUnet will use OS specific
tricks in order to try to figure out the PREFIX, but since the
testcase binaries are not installed, that trick does not work
for them).  Also, before running any testcases, you must
complete the installation first.  Quick summary:

$ ./configure --prefix=$SOMEWHERE
$ make
$ make install
$ export GNUNET_PREFIX=$SOMEWHERE
$ make check

If any testcases fail to pass on your system, run "contrib/report.sh"
and report the output together with information about the failing
testcase to the Mantis bugtracking system at
https://gnunet.org/bugs/.


Running http on port 80 and https on port 443
=============================================

In order to hide GNUnet's HTTP/HTTPS traffic perfectly, you might
consider running GNUnet's HTTP/HTTPS transport on port 80/443.
However, we do not recommend running GNUnet as root.  Instead, forward
port 80 to say 8080 with this command (as root, in your startup
scripts):

# iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080

or for HTTPS

# iptables -t nat -A PREROUTING -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 4433

Then set in the HTTP section of gnunet.conf the "ADVERTISED-PORT" to
"80" and "PORT" to 8080 and similarly in the HTTPS section the
"ADVERTISED-PORT" to "443" and "PORT" to 4433.

You can do the same trick for the TCP and UDP transports if you want
to map them to a priviledged port (from the point of view of the
network).  However, we are not aware of this providing any advantages
at this point.



Running the SMTP transport
==========================

// NOTE: SMTP is not currently available in this version of GNUnet
Running GNUnet over SMTP (e-mail) is a bit more involved.  Note that
you do not need to run all transports (only running the NAT transport
is the only thing that will not work).  If you really want to do
P2P over SMTP, read the instructions at http://gnunet.org/smtp


Stay tuned
==========

* https://gnunet.org/
* https://gnunet.org/bugs/
* https://gnunet.org/svn/
* http://www.gnu.org/software/gnunet/
* http://mail.gnu.org/mailman/listinfo/gnunet-developers
* http://mail.gnu.org/mailman/listinfo/help-gnunet
* http://mail.gnu.org/mailman/listinfo/info-gnunet
* http://mail.gnu.org/mailman/listinfo/gnunet-svn