nodejs/test/parallel/test-dns.js

// Copyright Joyent, Inc. and other Node contributors.
//
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'use strict';
const common = require('../common');
const assert = require('assert');

const dns = require('dns');

const existing = dns.getServers();
assert(existing.length > 0);

// Verify that setServers() handles arrays with holes and other oddities
assert.doesNotThrow(() => {
  const servers = [];

  servers[0] = '127.0.0.1';
  servers[2] = '0.0.0.0';
  dns.setServers(servers);
});

assert.doesNotThrow(() => {
  const servers = ['127.0.0.1', '192.168.1.1'];

  servers[3] = '127.1.0.1';
  servers[4] = '127.1.0.1';
  servers[5] = '127.1.1.1';

  Object.defineProperty(servers, 2, {
    enumerable: true,
    get: () => {
      servers.length = 3;
      return '0.0.0.0';
    }
  });

  dns.setServers(servers);
});

const goog = [
  '8.8.8.8',
  '8.8.4.4',
];
assert.doesNotThrow(() => dns.setServers(goog));
assert.deepStrictEqual(dns.getServers(), goog);
assert.throws(() => dns.setServers(['foobar']),
              /^Error: IP address is not properly formatted: foobar$/);
assert.deepStrictEqual(dns.getServers(), goog);

const goog6 = [
  '2001:4860:4860::8888',
  '2001:4860:4860::8844',
];
assert.doesNotThrow(() => dns.setServers(goog6));
assert.deepStrictEqual(dns.getServers(), goog6);

goog6.push('4.4.4.4');
dns.setServers(goog6);
assert.deepStrictEqual(dns.getServers(), goog6);

const ports = [
  '4.4.4.4:53',
  '[2001:4860:4860::8888]:53',
];
const portsExpected = [
  '4.4.4.4',
  '2001:4860:4860::8888',
];
dns.setServers(ports);
assert.deepStrictEqual(dns.getServers(), portsExpected);

assert.doesNotThrow(() => dns.setServers([]));
assert.deepStrictEqual(dns.getServers(), []);

assert.throws(() => {
  dns.resolve('example.com', [], common.mustNotCall());
}, /^TypeError: "rrtype" argument must be a string$/);

// dns.lookup should accept only falsey and string values
{
  const errorReg =
    /^TypeError: Invalid arguments: hostname must be a string or falsey$/;

  assert.throws(() => dns.lookup({}, common.mustNotCall()), errorReg);

  assert.throws(() => dns.lookup([], common.mustNotCall()), errorReg);

  assert.throws(() => dns.lookup(true, common.mustNotCall()), errorReg);

  assert.throws(() => dns.lookup(1, common.mustNotCall()), errorReg);

  assert.throws(() => dns.lookup(common.mustNotCall(), common.mustNotCall()),
                errorReg);
}

// dns.lookup should accept falsey values
{
  const checkCallback = (err, address, family) => {
    assert.ifError(err);
    assert.strictEqual(address, null);
    assert.strictEqual(family, 4);
  };

  assert.doesNotThrow(() => dns.lookup('', common.mustCall(checkCallback)));

  assert.doesNotThrow(() => dns.lookup(null, common.mustCall(checkCallback)));

  assert.doesNotThrow(() => dns.lookup(undefined,
                                       common.mustCall(checkCallback)));

  assert.doesNotThrow(() => dns.lookup(0, common.mustCall(checkCallback)));

  assert.doesNotThrow(() => dns.lookup(NaN, common.mustCall(checkCallback)));
}

/*
 * Make sure that dns.lookup throws if hints does not represent a valid flag.
 * (dns.V4MAPPED | dns.ADDRCONFIG) + 1 is invalid because:
 * - it's different from dns.V4MAPPED and dns.ADDRCONFIG.
 * - it's different from them bitwise ored.
 * - it's different from 0.
 * - it's an odd number different than 1, and thus is invalid, because
 * flags are either === 1 or even.
 */
assert.throws(() => {
  dns.lookup('nodejs.org', { hints: (dns.V4MAPPED | dns.ADDRCONFIG) + 1 },
             common.mustNotCall());
}, /^TypeError: Invalid argument: hints must use valid flags$/);

assert.throws(() => dns.lookup('nodejs.org'),
              /^TypeError: Invalid arguments: callback must be passed$/);

assert.throws(() => dns.lookup('nodejs.org', 4),
              /^TypeError: Invalid arguments: callback must be passed$/);

assert.doesNotThrow(() => dns.lookup('', {family: 4, hints: 0},
                                     common.mustCall()));

assert.doesNotThrow(() => {
  dns.lookup('', {
    family: 6,
    hints: dns.ADDRCONFIG
  }, common.mustCall());
});

assert.doesNotThrow(() => dns.lookup('', {hints: dns.V4MAPPED},
                                     common.mustCall()));

assert.doesNotThrow(() => {
  dns.lookup('', {
    hints: dns.ADDRCONFIG | dns.V4MAPPED
  }, common.mustCall());
});

assert.throws(() => dns.lookupService('0.0.0.0'),
              /^Error: Invalid arguments$/);

assert.throws(() => dns.lookupService('fasdfdsaf', 0, common.mustNotCall()),
              /^TypeError: "host" argument needs to be a valid IP address$/);

assert.throws(() => dns.lookupService('0.0.0.0', null, common.mustNotCall()),
              /^TypeError: "port" should be >= 0 and < 65536, got "null"$/);

assert.throws(
  () => dns.lookupService('0.0.0.0', undefined, common.mustNotCall()),
  /^TypeError: "port" should be >= 0 and < 65536, got "undefined"$/
);

assert.throws(() => dns.lookupService('0.0.0.0', 65538, common.mustNotCall()),
              /^TypeError: "port" should be >= 0 and < 65536, got "65538"$/);

assert.throws(() => dns.lookupService('0.0.0.0', 'test', common.mustNotCall()),
              /^TypeError: "port" should be >= 0 and < 65536, got "test"$/);

assert.throws(() => dns.lookupService('0.0.0.0', 80, null),
              /^TypeError: "callback" argument must be a function$/);