@libp2p/mdns NPM

@libp2p/mdns

Node.js libp2p mDNS discovery implementation for peer discovery

Install

$ npm i @libp2p/mdns

Usage

import { mdns } from '@libp2p/mdns'

const options = {
  peerDiscovery: [
    mdns()
  ]
}

async function start () {
  const libp2p = await createLibp2p(options)

  libp2p.on('peer:discovery', function (peerId) {
    console.log('found peer: ', peerId.toB58String())
  })

  await libp2p.start()
}

options
- peerName - Peer name to announce (should not be peeer id), default random string
- multiaddrs - multiaddrs to announce
- broadcast - (true/false) announce our presence through mDNS, default false
- interval - query interval, default 10 * 1000 (10 seconds)
- serviceTag - name of the service announce , default 'ipfs.local`

MDNS messages

A query is sent to discover the IPFS nodes on the local network

{
  type: 'query',
  questions: [ { name: 'ipfs.local', type: 'PTR' } ]
}

When a query is detected, each IPFS node sends an answer about itself

    [ { name: 'ipfs.local',
        type: 'PTR',
        class: 'IN',
        ttl: 120,
        data: 'QmNPubsDWATVngE3d5WDSNe7eVrFLuk38qb9t6vdLnu2aK.ipfs.local' },
      { name: 'QmNPubsDWATVngE3d5WDSNe7eVrFLuk38qb9t6vdLnu2aK.ipfs.local',
        type: 'SRV',
        class: 'IN',
        ttl: 120,
        data:
         { priority: 10,
           weight: 1,
           port: '20002',
           target: 'LAPTOP-G5LJ7VN9' } },
      { name: 'QmNPubsDWATVngE3d5WDSNe7eVrFLuk38qb9t6vdLnu2aK.ipfs.local',
        type: 'TXT',
        class: 'IN',
        ttl: 120,
        data: ['QmNPubsDWATVngE3d5WDSNe7eVrFLuk38qb9t6vdLnu2aK'] },
      { name: 'LAPTOP-G5LJ7VN9',
        type: 'A',
        class: 'IN',
        ttl: 120,
        data: '127.0.0.1' },
      { name: 'LAPTOP-G5LJ7VN9',
        type: 'AAAA',
        class: 'IN',
        ttl: 120,
        data: '::1' } ]

API Docs

https://libp2p.github.io/js-libp2p/modules/_libp2p_mdns.html

License

Licensed under either of

Apache 2.0, (LICENSE-APACHE / http://www.apache.org/licenses/LICENSE-2.0)
MIT (LICENSE-MIT / http://opensource.org/licenses/MIT)

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

IPFS

@libp2p/interface @libp2p/interface-internal @libp2p/peer-id @libp2p/utils @multiformats/multiaddr @types/multicast-dns dns-packet multicast-dns

@lodestar/beacon-node @everything-registry/sub-chunk-546 helia ipfs-node ipdw ipfs-core-config mt-libp2p mtxp2p moonbase-js @savid/libp2p-peeper @soketi/p2p sk-chain @autismjs/protocol @badaimweeb/js-protov2 @constl/ipa @zalastax/nolb-_lib @drtc/create @nabladelta/lambdadelta @libertynet/core

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@libp2p/mdns v10.0.22

@libp2p/mdns

Table of contents

Install

Usage

MDNS messages

API Docs

License

Contribution