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Yggdrasil support

NNCP is able to act as a node of Yggdrasil overlay network. Current IPv6 adoption for home users is relatively bad in many countries. That is why Yggdrasil overlay network uses dynamic spanning tree mesh network for packets routing, making it useful for gaining hosts high reachability without complex manual manipulations. By default it creates 200::/7 IPv6 network, where each host’s address is derived from its public key.

NNCP reuses Yggdrasil’s source code, but instead of relying on operating system’s network stack, that would require use of some kind full-featured TUN network interface, there is pure Go built-in stack, responsible for IPv6 and TCP protocols support. You do not need to think about network interfaces, addressing and firewall setup at all: nncp-daemon acts as Yggdrasil IPv6 reachable host, listening on single TCP port. You can reach it using ordinary non-Yggdrasil capable version of nncp-call, calling corresponding 200::/7 IPv6 address through native Yggdrasil daemon created TUN interface. nncp-daemon, nncp-call* can freely peer with Yggdrasil nodes, reusing existing infrastructure.

Only minor modifications were done to current NNCP’s tools:

How to start using NNCP through that overlay network?

  1. Generate ed25519 keypair, that will be used for identification and authentication of your node in Yggdrasil network:
    $ nncp-cfgnew -yggdrasil
    Public: 4fd64130e23cf7abdbc0fabdf2ae12bbc2ab7179861efa296d2beb0181ae07ea
    Private: 571fb05c81e62a572096566fd48e87ad47e706b1f600dd625ebbf86d310332624fd64130e23cf7abdbc0fabdf2ae12bbc2ab7179861efa296d2beb0181ae07ea

    You should share that public key with other NNCP peers.

  2. Start nncp-daemon listening on Yggdrasil’s incoming connections. You have to specify:
    • Your private key (generated above). Yggdrasil’s PrivateKey analogue.
    • Optional non-default port you will listen on Yggdrasil’s IPv6 address.
    • Optional list of bind addresses, used for peering between the nodes. Yggdrasil’s Listen analogue.
    • Optional list of peer addresses you should connect to. Yggdrasil’s Peers analogue.
    • Optional list of allowed peer public keys, allowed for incoming peering connections from. Yggdrasil’s AllowedPublicKeys analogue.
    • Optional list of multicast-related regular expressions to match desired network interfaces where Yggdrasil multicasting must be enabled. Beacon and listening are always enabled on them, but optionally you can specify port you forcefully want to listen on.
    $ nncp-daemon -yggdrasil "yggdrasils://571f...07ea:6789"\

    That yggdrasils:// is transformed to following Yggdrasil’s configuration analogue:

      PrivateKey: 571f...07ea
      Listen: ["tcp://[::1]:1234", "tcp://[2001::1]:1234"]
      AllowedPublicKeys: ["c6b7...9469", "eb2d...ca07"]
      Peers: [
      MulticastInterfaces: [
            Regex: .*
            Beacon: true
            Listen: true
            Port: 5400
        }, {
            Regex: lo0
            Beacon: true
            Listen: true
            Port: 0

    Basically you have to specify only private key and either bind or peer address. Look for Yggdrasil’s documentation for more description of each option and related behaviour.

    As you can see, private key is in command line arguments, that could be treated as a security issue. That is why it is preferred to specify them in configuration’s yggdrasil-aliases section, where you can alias all of entities and reference them in -yggdrasil or yggdrasilc://-addresses:

    yggdrasil-aliases: {
      myprv: 571f...07ea
      bindPublic: tcp://[2001::1]:1234
      bindLocalhost: tcp://[::1]:2345
      peerBE: tcp://
      peerRU: tcp://
      somePeerPub1: c6b7...9469
      somePeerPub2: eb2d...ca07
      remoteAlicePub: 52be...3c14
      mcastAll: .*:5400

    And now you can more conveniently and safely specify:

    $ nncp-daemon -yggdrasil "yggdrasils://myprv:6789"\
  3. Make calls to that node from another ones, by using yggdrasilc://-address, similarly:

    where PUB is remote node’s public key.

    $ nncp-call alice "yggdrasilc://remoteAlicePub?prv=myprv&mcast=mcastAll"

Per private key Yggdrasil core goroutine is started when first call is initiated and stays until program is finished. You can have multiple Yggdrasil-related private keys and multiple (Yggdrasil) cores will work simultaneously. But running multiple cores for one private key with varying configuration (except for destination public key of course) is not supported.

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