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Admin API

The admin socket provides an interface to query and configure Yggdrasil during runtime. By default, Yggdrasil listens for admin connections on localhost:9001.

Control Utility

The yggdrasilctl utility provides a human-friendly CLI interface to the Yggdrasil admin socket. It can connect to both local and remote Yggdrasil instances, and accepts the same verbs as below. Every field is specified in the field=value format.

Examples include:

yggdrasilctl getDHT
yggdrasilctl getPeers

To get a list of supported commands:

yggdrasilctl list

To perform an action on a remote Yggdrasil node, specify the -endpoint parameter:

yggdrasilctl -endpoint=tcp://10.0.0.1:9001 getPeers
yggdrasilctl -endpoint=unix:///var/run/yggdrasil.sock getDHT

To get the JSON response body instead of a “friendly” output, specify the -json parameter:

yggdrasilctl -json getPeers

Admin Socket

The Yggdrasil admin socket uses JSON for request and response formats.

A request must be:

• A complete JSON stanza
• Followed by a newline \n character

Once a valid request is received, the response stanza is returned.

Request

The structure of a typical request is as below:

{
  "request": "XXX",
  "foo": "bar",
  "baz": "qux"
}

A request:

• Must have a "request" (string) field - a value containing the verb of the request
• Can have a "keepalive" (bool) field - a true or false value stating whether the connection should be kept alive for further requests (if not specified, Yggdrasil will close the admin connection after returning a response)
• Must have any other required fields for the request
• Can have any other optional fields for the request

Response

A typical response is structured like this:

{
  "request":
  {
    "request": "XXX",
    "foo": "bar",
    "baz": "qux"
  },

  "response":
  {
  },

  "status": "success"
}

A response:

• Always has a "request" (string) field, which contains the body of the original request
• Always has a "status" (string) field, which is either "success" or "error"
• Optionally has a "response" section, which contains the response data from the request
• Optionally has an "error" (string) field, which contains error text

Request Types

The "request" field contains a verb that describes which request to perform.

getDHT

Expects no additional request fields.

Returns known nodes in the DHT.

• key (string) contains the PublicKey of the remote node
• port (int)
• rest (int)

getPeers

Expects no additional request fields.

Returns one or more records containing information about active peer sessions. The first record typically refers to the current node.

For each IPv6 address:

• key (string) contains the PublicKey of the remote node
• port (uint8) contains the local switch port number for that peer
• coords ([]int) contains the coordinates of the node on the spanning tree
• remote (string) contains the peering URI of the remote peer

getSelf

Expects no additional request fields.

Returns exactly one record containing information about the current Yggdrasil node.

For the current IPv6 address:

• key (string) contains the EncryptionPublicKey of the current node
• build_name (string) contains the build name, if available (e.g. yggdrasil, yggdrasil-develop)
• build_version (string) contains the build version, if available (e.g. 0.3.0, 0.2.7-0091)
• coords ([]int) contains the coordinates of the node on the spanning tree
• subnet (string) contains the routed IPv6 subnet for this host

getSessions

Expects no additional request fields.

Returns zero or more records containing information about open sessions between the current Yggdrasil node and other nodes. Open sessions indicate that traffic has been exchanged with the remote node recently.

For each IPv6 address:

• key (string) contains the EncryptionPublicKey of the remote node

getTunTap

Expects no additional request fields.

Returns exactly one record containing information about the current node’s TUN/TAP adapter.

For each adapter:

• mtu (uint8) contains the MTU of the local TUN/TAP adapter

getMulticastInterfaces

Expects no additional request fields.

Returns zero or more strings containing the enabled multicast peering interfaces.

If zero strings are returned then it is implied that multicast peering is not allowed on any interface.

getNodeInfo

Expects:

• key= string, hex-encoded public key of the remote node to ping, in the same format as e.g. verbose output from a getDHT response

Asks a remote node to respond with their nodeinfo.

Returns a nodeinfo section with the nodeinfo. This can be in any format, containing any keys.