gnunet/src/vpn

For Users
=========

To use the gnunet-vpn you have to have at least the following configuration in
your ~/.gnunet/gnunet.conf:

#v+
TODO
#v-

If you start gnunet now, you will get a new network-interface called
gnunet-vpn (or however you named it) with the IP addresses you configured. You
"normal" internet-usage should not be impaired (check that!) but you should be
able to point your web browser to something like http://gnunet.gnunet/ and the
the gnunet webpage! That's it, you are set to use gnunet to access legacy
services!

If you want to offer services such as your webpage vi gnunet you have to have
a file ~/.gnunet/dns.conf with the following content:

#v+
TODO
#v-

Also you will have to configure and start the exit-daemon:

#v+
TODO
#v-

Now point you computer (or any other computer in the gnunet) to
http://yourwebsite.gnunet/ and you will get your website.

Add the following options if you want to resolve DNS-queries for other users
of gnunet:

#v+
TODO
#v-

Add the following options if you want to provide access to your internet
connection to other users of gnunet:

#v+
TODO
#v-

Be aware, that this enables people to use your internet connection for
nefarious things which might make you liable!

For Developers
==============

The gnunet-vpn is a combination of three programs:

- gnunet-daemon-vpn opens a tap-interface, configures it and controls the
network
- gnunet-service-dns configures a hijack for outgoing DNS-requests, so that
they get sent to gnunet-daemon-vpn, which sends them on to
gnunet-service-dns which sends them on, either to their original destination
or to gnunet. It also publishes names from dns.conf to the dht.
- gnunet-daemon-exit takes gets connections from the gnunet and sends them on
to the legacy internet.

The gnunet-service-dns decides where to send the query with an easy check:

- it is a query for something.gnunet: it gets sent to the dht
- it is a query sent to the configured VIRT_DNS: it gets sent on to some other
gnunet-service-dns somewhere in the gnunet (anyone having configured
DNS_EXIT TODO)
- else: it gets sent to the original destination

These programs exchange whole TCP- or UDP-packets, they only strip of the
IP-header. This way gnunet achieves translation between IPv6-services and
IPv4-clients and vice versa!