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1<p align="center">
2 <a href="https://gnunet.org"><img src="contrib/branding/logo/gnunet-logo-dark-text.svg" alt="GNUnet" width="300px"/></a>
3</p>
4
5> GNUnet is a *new* network protocol stack for building secure, distributed, and privacy-preserving applications.
6
7* [Install](#how-to-install-gnunet)
8 * [From Source](#from-source)
9 * [Using Docker](#docker)
10* [Using GNUnet](#using-gnunet)
11* [License](#license)
12
13How to Install GNUnet
14---------------------
15
16### 1. From Source
17
18**Dependencies**
19
20Install these packages. Some of them may need to be installed from source depending on your OS.
21
22```
23- libmicrohttpd >= 0.9.42 (available from https://www.gnu.org/software/libmicrohttpd/)
24- libgcrypt >= 1.6
25- libgnurl >= 7.35.0 (recommended, available from https://gnunet.org/gnurl)
26- libcurl >= 7.35.0 (alternative to libgnurl)
27- libunistring >= 0.9.2
28- gnutls >= 3.2.12 (highly recommended: a gnutls linked against libunbound)
29- libidn >= 1.0
30- libextractor >= 0.6.1 (highly recommended)
31- openssl >= 1.0 (binary, used to generate X.509 certificate)
32- libltdl >= 2.2 (part of GNU libtool)
33- sqlite >= 3.8 (default database, required)
34- mysql >= 5.1 (alternative to sqlite)
35- postgres >= 9.5 (alternative to sqlite)
36- Texinfo >= 5.2 [*1]
37- which (for the bootstrap script)
38- gettext
39- zlib
40- pkg-config
41```
42
43
44You can also install the dependencies with the [GNU Guix package manager:](https://https://www.gnu.org/software/guix/) by using the provided environment file:
45
46```shell
47guix package -l guix-env.scm
48```
49
50
51**Using GNU Make**
52
53```shell
54./bootstrap # Run this to generate the configure files.
55./configure # See the various flags avalable to you.
56make
57make install
58```
59
60**Using the [GNU Guix package manager:](https://https://www.gnu.org/software/guix/)**
61
62```shell
63# To build, run tests, and install:
64guix package -f guix-env.scm
65
66# To skip the testing phase:
67guix package -f guix-env.scm:notest
68```
69
70
71### 2. Docker
72
73```
74docker build -t gnunet .
75```
76
77
78
79Using GNUnet
80-------------
81
82There are many possible ways to use the subsystems of GNUnet, so we will provide a few examples in this section.
83
84<p align="center">
85 <a href="contrib/gnunet-arch-full.svg"><img src="contrib/gnunet-arch-full.svg" alt="GNUnet Modular Architecture" width="600px" border="1px"/></a>
86</p>
87
88>***GNUnet is composed of over 30 modular subsystems***
89
90
91### Start GNUnet Services
92
93Before we can begin using most of the components we must start them.
94
95```shell
96gnunet-arm --start
97```
98
99Now we can open up another shell and try using some of the modules.
100
101### Cadet
102
103#### Examples
104
105Open a Cadet connection:
106
107```shell
108# Node 1
109gnunet-cadet -o <shared secret>
110```
111
112Conect to peer:
113
114```shell
115# Node 2
116gnunet-cadet <peer-id of Node 1> <shared secret>
117```
118
119#### Sharing Files
120
121With the cli tool, you can also share files:
122
123```shell
124# Node 1
125gnunet-cadet -o <shared secret> > filename
126```
127
128On the Node 2 we're going to send the file to Node 1, and to do this we need to make use of [coprocesses](https://www.gnu.org/software/bash/manual/html_node/Coprocesses.html).
129The syntax for using coprocesses varies per shell. In our example we are assuming Bash. More info for different shells can be found [here](https://unix.stackexchange.com/questions/86270/how-do-you-use-the-command-coproc-in-various-shells)
130
131```shell
132# Node 2
133coproc gnunet-cadet <peer-id of Node 1> <shared secret>
134cat <file> >&"${COPROC[1]}"
135```
136
137Now this enables us to do some fun things, such as streaming video by piping to a media player:
138
139```shell
140# Node 1
141gnunet-cadet -o <shared secret> | vlc -
142```
143
144```shell
145# Node 2
146coproc gnunet-cadet <peer-id of Node 1> <shared secret>
147cat <video-file> >&"${COPROC[1]}"
148```
149
150### Filesharing
151
152You can use GNUnet as a content-addressed storage, much like IPFS: sharing immutable files in a decentralized fashion with added privacy.
153
154For instance, you can get a nice cat picture with
155```sh
156gnunet-download gnunet://fs/loc/CB0ZX5EM1ZNNRT7AX93RVHCN1H49242DWZ4AXBTCJBAG22Z33VHYMR61J71YJXTXHEC22TNE0PRWA6D5X7NFNY2J9BNMG0SFN5DKZ0G.R48JSE2T4Y3W2AMDHZYX2MMDJC4HR0BVTJYNWJT2DGK7EQXR35DT84H9ZRAK3QTCTHDBAE1S6W16P8PCKC4HGEEKNW2T42HXF9RS1J0.1906755.J5Z3BDEG2PW332001GGZ2SSKCCSV8WDM696HNARG49X9TMABC4DG.B6Y7BCJ6B5K40EXCXASX1HQAD8MBJ9WTFWPCE3F15Q3Q4Y2PB8BKVGCS5HA4FG4484858NB74PBEE5V1638MGG7NS40A82K7QKK3G0G.1577833200 --output cat.png
157```
158
159You can also give files to the network, like so:
160
161```sh
162$ echo "I love GNUnet" > ILoveGNUnet.txt
163$ gnunet-publish ILoveGNUnet.txt
164
165Publishing `/tmp/ILoveGNUnet.txt` done.
166URI is `gnunet://fs/chk/SXA4RGZWDHE4PDWD2F4XG778J4SZY3E3SNDZ9AWFRZYYBV52W1T2WQNZCF1NYAT842800SSBQ8F247TG6MX7H4S1RWZZSC8ZXGQ4YPR.AZ3B5WR1XCWCWR6W30S2365KFY7A3R5AMF5SRN3Z11R72SMVQDX3F6GXQSZMWZGM5BSYVDQEJ93CR024QAAE65CKHM52GH8MZK1BM90.14`.
167```
168
169The URI you get is what you can use to retrieve the file with `gnunet-download`.
170
171### GNS
172
173*coming soon*
174
175
176### VPN
177
178#### "Half-hidden" services
179
180You can tunnel IP traffic through GNUnet allowing you to offer web, [rsh](https://linux.die.net/man/1/rsh), messaging or other servers without revealing your IP address.
181
182This is similar to Tor's Hidden (aka Onion) services, but currently does not provide as much privacy as onion routing isn't yet implemented; on the other hand, you can tunnel UDP, unlike Tor.
183
184#### Configuring server
185
186First, set up access from GNUnet to IP with `exit`:
187
188`gnunet.conf`:
189```
190[exit]
191FORCESTART = YES
192EXIT_IPV4 = YES
193EXIT_RANGE_IPV4_POLICY = 169.254.86.1;
194```
195
196Exit, by the way can also be used as a general-purpose IP proxy i.e. exit relay but here we restrict IPs to be accessed to those we'll be serving stuff on only.
197
198Then, start up a server to be shared. For the sake of example,
199
200```sh
201python3 -m http.server 8080
202```
203
204Now to configure the actual "half-hidden service". The config syntax is as follows:
205
206```sh
207[<shared secret>.gnunet.]
208TCP_REDIRECTS = <exposed port>:<local IP>:<local port>
209```
210
211...which for our example would be
212
213```sh
214[myhttptest.gnunet.]
215TCP_REDIRECTS = 80:169.254.86.1:8080
216```
217
218Local IP can be anything (if allowed by other configuration) but a localhost address (in other words, you can't bind a hidden service to the loopback interface and say 127.0.0.1 in `TCP_REDIRECTS`). The packets will appear as coming from the exit TUN interface to whatever address is configured in `TCP_REDIRECTS` (unlike SSH local forwarding, where the packets appear as coming from the loopback interface) and so they will not be forwarded to 127.0.0.1.
219
220You can share access to this service with a peer id, shared secret and IP port numbler: here `gnunet-peerinfo -s`, `myhttptest` and `80` respectively.
221
222#### Connecting
223
224`gnunet-vpn` gives you ephemeral IPs to connect to if you tell it a peer id and a shared secret, like so:
225
226```sh
227$ gnunet-vpn -p N7R25J8ADR553EPW0NFWNCXK9V80RVCP69QJ47XMT82VKAR7Y300 -t -s myhttptest
22810.11.139.20
229
230# And just connect to the given IP
231$ wget 10.11.139.20
232Connecting to 10.11.139.20:80... connected.
233```
234
235(You can try it out with your browser too.)
236
237### Running a Hostlist Server
238
239*coming soon*
240
241GNUnet Configuration
242--------------------------
243### Examples
244
245```yaml
246[transport]
247OPTIONS = -L DEBUG
248PLUGINS = tcp
249#PLUGINS = udp
250
251[transport-tcp]
252OPTIONS = -L DEBUG
253BINDTO = 192.168.0.2
254```
255
256TODO: *explain what this does and add more*
257
258
259Philosophy
260-------------------------
261
262GNUnet is made for an open society: It's a self-organizing network and it's [http://www.gnu.org/philosophy/free-sw.html](free software) as in freedom. GNUnet puts you in control of your data. You determine which data to share with whom, and you're not pressured to accept compromises.
263
264
265Related Projects
266-------------------------
267
268 <a href="https://pep.foundation"><img src="https://pep.foundation/static/media/uploads/peplogo.svg" alt="pep.foundation" width="80px"/></a> <a href="https://secushare.org"><img src="https://secushare.org/img/secushare-0444.png" alt="Secushare" width="80px"/></a>