dns-socket

Make low-level DNS requests with retry and timeout support.

npm install dns-socket

Usage

const dnsSocket = require('dns-socket')
const socket = dnsSocket()

socket.query({
  questions: [{
    type: 'A',
    name: 'google.com'
  }]
}, 53, '8.8.8.8', (err, res) => {
  console.log(err, res) // prints the A record for google.com
})

API

var socket = dns([options])

Create a new DNS socket instance. The options object includes:

• retries Number: Number of total query attempts made during timeout. Default: 5.
• socket Object: A custom dgram socket. Default: A 'udp4' socket.
• timeout Number: Total timeout in milliseconds after which a 'timeout' event is emitted. Default: 7500.

socket.on('query', query, port, host)

Emitted when a dns query is received. The query is a dns-packet

socket.on('response', response, port, host)

Emitted when a dns response is received. The response is a dns-packet

var id = socket.query(query, port, [host], [callback])

Send a dns query. If host is omitted it defaults to localhost. When the remote replies the callback is called with (err, response, query) and an response is emitted as well. If the query times out the callback is called with an error.

Returns the query id

socket.response(query, response, port, [host])

Send a response to a query.

socket.cancel(id)

Cancel a query

socket.bind([port][, address][, onlistening])

socket.bind(options, [onlistening])

Bind the underlying udp socket to a specific port. Takes the same arguments as socket#bind.

socket.destroy([onclose])

Destroy the socket.

socket.inflight

Number of inflight queries.

License

MIT