1 | 'use strict'
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2 |
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3 | var os = require('os')
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4 | var util = require('util')
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5 | var EventEmitter = require('events').EventEmitter
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6 | var serviceName = require('multicast-dns-service-types')
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7 | var txt = require('dns-txt')()
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8 |
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9 | var TLD = '.local'
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10 |
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11 | module.exports = Service
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12 |
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13 | util.inherits(Service, EventEmitter)
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14 |
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15 | function Service (opts) {
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16 | if (!opts.name) throw new Error('Required name not given')
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17 | if (!opts.type) throw new Error('Required type not given')
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18 | if (!opts.port) throw new Error('Required port not given')
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19 |
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20 | this.name = opts.name
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21 | this.protocol = opts.protocol || 'tcp'
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22 | this.type = serviceName.stringify(opts.type, this.protocol)
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23 | this.host = opts.host || os.hostname()
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24 | this.port = opts.port
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25 | this.fqdn = this.name + '.' + this.type + TLD
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26 | this.subtypes = opts.subtypes || null
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27 | this.txt = opts.txt || null
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28 | this.published = false
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29 |
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30 | this._activated = false
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31 | }
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32 |
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33 | Service.prototype._records = function () {
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34 | var records = [rr_ptr(this), rr_srv(this), rr_txt(this)]
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35 |
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36 | var self = this
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37 | var interfaces = os.networkInterfaces()
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38 | Object.keys(interfaces).forEach(function (name) {
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39 | interfaces[name].forEach(function (addr) {
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40 | if (addr.internal) return
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41 | if (addr.family === 'IPv4') {
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42 | records.push(rr_a(self, addr.address))
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43 | } else {
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44 | records.push(rr_aaaa(self, addr.address))
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45 | }
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46 | })
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47 | })
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48 |
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49 | return records
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50 | }
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51 |
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52 | function rr_ptr (service) {
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53 | return {
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54 | name: service.type + TLD,
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55 | type: 'PTR',
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56 | ttl: 28800,
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57 | data: service.fqdn
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58 | }
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59 | }
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60 |
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61 | function rr_srv (service) {
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62 | return {
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63 | name: service.fqdn,
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64 | type: 'SRV',
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65 | ttl: 120,
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66 | data: {
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67 | port: service.port,
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68 | target: service.host
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69 | }
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70 | }
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71 | }
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72 |
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73 | function rr_txt (service) {
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74 | return {
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75 | name: service.fqdn,
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76 | type: 'TXT',
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77 | ttl: 4500,
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78 | data: txt.encode(service.txt)
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79 | }
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80 | }
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81 |
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82 | function rr_a (service, ip) {
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83 | return {
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84 | name: service.host,
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85 | type: 'A',
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86 | ttl: 120,
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87 | data: ip
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88 | }
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89 | }
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90 |
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91 | function rr_aaaa (service, ip) {
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92 | return {
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93 | name: service.host,
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94 | type: 'AAAA',
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95 | ttl: 120,
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96 | data: ip
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97 | }
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98 | }
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