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node_modules/multicast-dns/cli.js

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+#!/usr/bin/env node
+
+var mdns = require('./')()
+var path = require('path')
+var os = require('os')
+
+var announcing = process.argv.indexOf('--announce') > -1
+
+if (process.argv.length < 3) {
+  console.error('Usage: %s <hostname>', path.basename(process.argv[1]))
+  process.exit(1)
+}
+var hostname = process.argv[2]
+
+if (announcing) {
+  var ip = getIp()
+  mdns.on('query', function (query, rinfo) {
+    query.questions.forEach(function (q) {
+      if (q.name === hostname) {
+        console.log('Responding %s -> %s', q.name, ip)
+        mdns.respond({
+          answers: [{
+            type: 'A',
+            name: q.name,
+            data: ip
+          }]
+        }, {port: rinfo.port})
+      }
+    })
+  })
+} else {
+  mdns.on('response', function (response) {
+    response.answers.forEach(function (answer) {
+      if (answer.name === hostname) {
+        console.log(answer.data)
+        process.exit()
+      }
+    })
+  })
+
+  mdns.query(hostname, 'A')
+
+  // Give responses 3 seconds to respond
+  setTimeout(function () {
+    console.error('Hostname not found')
+    process.exit(1)
+  }, 3000)
+}
+
+function getIp () {
+  var networks = os.networkInterfaces()
+  var found = '127.0.0.1'
+
+  Object.keys(networks).forEach(function (k) {
+    var n = networks[k]
+    n.forEach(function (addr) {
+      if (addr.family === 'IPv4' && !addr.internal) {
+        found = addr.address
+      }
+    })
+  })
+
+  return found
+}