multicast-dns

WebJar for multicast-dns

License

License

MIT
GroupId

GroupId

org.webjars.npm
ArtifactId

ArtifactId

multicast-dns
Last Version

Last Version

7.2.0
Release Date

Release Date

Type

Type

jar
Description

Description

multicast-dns
WebJar for multicast-dns
Project URL

Project URL

http://webjars.org
Source Code Management

Source Code Management

https://github.com/mafintosh/multicast-dns

Download multicast-dns

How to add to project

<!-- https://jarcasting.com/artifacts/org.webjars.npm/multicast-dns/ -->
<dependency>
    <groupId>org.webjars.npm</groupId>
    <artifactId>multicast-dns</artifactId>
    <version>7.2.0</version>
</dependency>
// https://jarcasting.com/artifacts/org.webjars.npm/multicast-dns/
implementation 'org.webjars.npm:multicast-dns:7.2.0'
// https://jarcasting.com/artifacts/org.webjars.npm/multicast-dns/
implementation ("org.webjars.npm:multicast-dns:7.2.0")
'org.webjars.npm:multicast-dns:jar:7.2.0'
<dependency org="org.webjars.npm" name="multicast-dns" rev="7.2.0">
  <artifact name="multicast-dns" type="jar" />
</dependency>
@Grapes(
@Grab(group='org.webjars.npm', module='multicast-dns', version='7.2.0')
)
libraryDependencies += "org.webjars.npm" % "multicast-dns" % "7.2.0"
[org.webjars.npm/multicast-dns "7.2.0"]

Dependencies

compile (2)

Group / Artifact Type Version
org.webjars.npm : dns-packet jar [4.0.0,5)
org.webjars.npm : thunky jar [1.0.2,2)

Project Modules

There are no modules declared in this project.

multicast-dns

Low level multicast-dns implementation in pure javascript

npm install multicast-dns

build status

Usage

var mdns = require('multicast-dns')()

mdns.on('response', function(response) {
  console.log('got a response packet:', response)
})

mdns.on('query', function(query) {
  console.log('got a query packet:', query)
})

// lets query for an A record for 'brunhilde.local'
mdns.query({
  questions:[{
    name: 'brunhilde.local',
    type: 'A'
  }]
})

Running the above (change brunhilde.local to your-own-hostname.local) will print an echo of the query packet first

got a query packet: { type: 'query',
  questions: [ { name: 'brunhilde.local', type: 'A', class: 1 } ],
  answers: [],
  authorities: [],
  additionals: [] }

And then a response packet

got a response packet: { type: 'response',
  questions: [],
  answers:
   [ { name: 'brunhilde.local',
       type: 'A',
       class: 'IN',
       ttl: 120,
       flush: true,
       data: '192.168.1.5' } ],
  authorities: [],
  additionals:
   [ { name: 'brunhilde.local',
       type: 'A',
       class: 'IN',
       ttl: 120,
       flush: true,
       data: '192.168.1.5' },
     { name: 'brunhilde.local',
       type: 'AAAA',
       class: 'IN',
       ttl: 120,
       flush: true,
       data: 'fe80::5ef9:38ff:fe8c:ceaa' } ] }

CLI

npm install -g multicast-dns
multicast-dns brunhilde.local
> 192.168.1.1

API

A packet has the following format

{
  questions: [{
    name:'brunhilde.local',
    type:'A'
  }],
  answers: [{
    name:'brunhilde.local',
    type:'A',
    ttl:seconds,
    data:(record type specific data)
  }],
  additionals: [
    (same format as answers)
  ],
  authorities: [
    (same format as answers)
  ]
}

Currently data from SRV, A, PTR, TXT, AAAA and HINFO records is passed

mdns = multicastdns([options])

Creates a new mdns instance. Options can contain the following

{
  multicast: true // use udp multicasting
  interface: '192.168.0.2' // explicitly specify a network interface. defaults to all
  port: 5353, // set the udp port
  ip: '224.0.0.251', // set the udp ip
  ttl: 255, // set the multicast ttl
  loopback: true, // receive your own packets
  reuseAddr: true // set the reuseAddr option when creating the socket (requires node >=0.11.13)
}

mdns.on('query', (packet, rinfo))

Emitted when a query packet is received.

mdns.on('query', function(query) {
  if (query.questions[0] && query.questions[0].name === 'brunhilde.local') {
    mdns.respond(someResponse) // see below
  }
})

mdns.on('response', (packet, rinfo))

Emitted when a response packet is received.

The response might not be a response to a query you send as this is the result of someone multicasting a response.

mdns.query(packet, [cb])

Send a dns query. The callback will be called when the packet was sent.

The following shorthands are equivalent

mdns.query('brunhilde.local', 'A')
mdns.query([{name:'brunhilde.local', type:'A'}])
mdns.query({
  questions: [{name:'brunhilde.local', type:'A'}]
})

mdns.respond(packet, [cb])

Send a dns response. The callback will be called when the packet was sent.

// reply with a SRV and a A record as an answer
mdns.respond({
  answers: [{
    name: 'my-service',
    type: 'SRV',
    data: {
      port:9999,
      weigth: 0,
      priority: 10,
      target: 'my-service.example.com'
    }
  }, {
    name: 'brunhilde.local',
    type: 'A',
    ttl: 300,
    data: '192.168.1.5'
  }]
})

The following shorthands are equivalent

mdns.respond([{name:'brunhilde.local', type:'A', data:'192.158.1.5'}])
mdns.respond({
  answers: [{name:'brunhilde.local', type:'A', data:'192.158.1.5'}]
})

mdns.destroy()

Destroy the mdns instance. Closes the udp socket.

Development

To start hacking on this module you can use this example to get started

git clone git://github.com/mafintosh/multicast-dns.git
npm install
node example.js
node cli.js $(hostname).local

License

MIT

Versions

Version
7.2.0
6.2.3