connectivity

A library providing an ACN (Anonymous Communication Network ) networking abstraction

Supported ACNs

• Tor v3 Onion Services

Environment Variables

• TOR_LD_LIBRARY_PATH - override the library path given to the Tor process as different from the one given to the parent process.
• CWTCH_RESTRICT_PORTS - forces connectivity to bind to a subset of ports 15000-15378
• CWTCH_BIND_EXTERNAL_WHONIX - forces connectivity to bind to external interfaces (only supported/recommended on certain Whonix-based setups. Please open an issue if you think this should be expanded.)

Requirements for ACN Support

• Reference an EndPoint via a string / hostname
• Maintain an endpoint via a PublicKey (the underlying crypto is the responsibility of the implementation)

Using

Each ACN implementation provides a specific start function that takes in the required parameters to e.g. find a specific binary on the system, attempt to talk to a specific system service or launch an in-memory networking manager:

    acn, err := NewTorACN(".", "", 9051, HashedPasswordAuthenticator{"examplehasedpassword"})
    if err != nil {
        t.Error(err)
        return
    }

At this point the ACN is responsible for setting up the networking interface, the result of which can be checked via the Status callback:

    acn.SetStatusCallback(getStatusCallback(progChan))

    progress := 0
    for progress < 100 {
        progress = <-progChan
    }

Once initialized the ACN can be used to open new connections:

    conn,err := acn.Open(hostname);

Or host a service on the ACN:

    ls,err := acn.Listen(identity, port) ;

We also provide closing and restart functionality for managing the networking service:

    acn.Restart()

and

    acn.Close()