app.portBindings and newManifest.tcpPorts may be null

src/digitalocean.js

@@ -0,0 +1,46 @@
+/* jslint node:true */
+
+'use strict';
+
+exports = module.exports = {
+    checkPtrRecord: checkPtrRecord
+};
+
+var assert = require('assert'),
+    debug = require('debug')('box:digitalocean'),
+    dns = require('native-dns');
+
+function checkPtrRecord(ip, fqdn, callback) {
+    assert(ip === null || typeof ip === 'string');
+    assert.strictEqual(typeof fqdn, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    debug('checkPtrRecord: ' + ip);
+
+    if (!ip) return callback(new Error('Network down'));
+
+    dns.resolve4('ns1.digitalocean.com', function (error, rdnsIps) {
+        if (error || rdnsIps.length === 0) return callback(new Error('Failed to query DO DNS'));
+
+        var reversedIp = ip.split('.').reverse().join('.');
+
+        var req = dns.Request({
+            question: dns.Question({ name: reversedIp + '.in-addr.arpa', type: 'PTR' }),
+            server: { address: rdnsIps[0] },
+            timeout: 5000
+        });
+
+        req.on('timeout', function () { return callback(new Error('Timedout')); });
+
+        req.on('message', function (error, message) {
+            if (error || !message.answer || message.answer.length === 0) return callback(new Error('Failed to query PTR'));
+
+            debug('checkPtrRecord: Actual:%s Expecting:%s', message.answer[0].data, fqdn);
+            callback(null, message.answer[0].data === fqdn);
+        });
+
+        req.send();
+    });
+}
+
+