utun

Make TUN devices

npm i utun

Usage

const UTUN = require('utun')
const ip = require('ip-packet')

const u = new UTUN()

u.configure({
  ip: '10.22.0.10',
  netmask: '255.255.255.255',
  route: '10.22.0.0/24'
})

u.on('data', function (buffer) {
  console.log(ip.decode({ start: 0, end: buffer.byteLength, buffer }))
})

API

new UTUN(opts = {})

opts

• name set interface name where supported, defaults to tunnel0

async configure(opts)

Attempts to normalize interface configuration across platforms.

opts

• ip assigns address to interface
• netmask sets netmask
• route adds an additional route

note1: on linux the route option may have to be omitted as as system adds route ip/netmask to interface by default.
Use ip route show to verify routes after configure resolves.

note2: on mac, packets to local address (utun.ip) are captured by default.
Use route -n to verify routes after configure resolves.

async write(buffer)

Transmits a packet on the tunnel device, resolves when packet is was enqueued.

tryWrite(buffer)

Same as write but does not retry when queue is full. Simply returns boolean indicating wether packet was accepted or not.

async close()

Closes the interface

info(reset = false)

Exports tunnel statistics and counters.

sample:

{
  name: 'tunnel0',
  rxBytes: 1188,
  rxPackets: 10,
  rxDrop: 5,
  txBytes: 0,
  txPackets: 0,
  txRejected: 0
}

• reset resets all counters.

License

Apache-2.0