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1// Copyright Joyent, Inc. and other Node contributors.
2//
3// Permission is hereby granted, free of charge, to any person obtaining a
4// copy of this software and associated documentation files (the
5// "Software"), to deal in the Software without restriction, including
6// without limitation the rights to use, copy, modify, merge, publish,
7// distribute, sublicense, and/or sell copies of the Software, and to permit
8// persons to whom the Software is furnished to do so, subject to the
9// following conditions:
10//
11// The above copyright notice and this permission notice shall be included
12// in all copies or substantial portions of the Software.
13//
14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
20// USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22'use strict';
23const common = require('../common');
24const dnstools = require('../common/dns');
25const assert = require('assert');
26
27const dns = require('dns');
28const dnsPromises = dns.promises;
29const dgram = require('dgram');
30
31const existing = dns.getServers();
32assert(existing.length > 0);
33
34// Verify that setServers() handles arrays with holes and other oddities
35{
36  const servers = [];
37
38  servers[0] = '127.0.0.1';
39  servers[2] = '0.0.0.0';
40  dns.setServers(servers);
41
42  assert.deepStrictEqual(dns.getServers(), ['127.0.0.1', '0.0.0.0']);
43}
44
45{
46  const servers = ['127.0.0.1', '192.168.1.1'];
47
48  servers[3] = '127.1.0.1';
49  servers[4] = '127.1.0.1';
50  servers[5] = '127.1.1.1';
51
52  Object.defineProperty(servers, 2, {
53    enumerable: true,
54    get: () => {
55      servers.length = 3;
56      return '0.0.0.0';
57    }
58  });
59
60  dns.setServers(servers);
61  assert.deepStrictEqual(dns.getServers(), [
62    '127.0.0.1',
63    '192.168.1.1',
64    '0.0.0.0',
65  ]);
66}
67
68{
69  // Various invalidities, all of which should throw a clean error.
70  const invalidServers = [
71    ' ',
72    '\n',
73    '\0',
74    '1'.repeat(3 * 4),
75    // Check for REDOS issues.
76    ':'.repeat(100000),
77    '['.repeat(100000),
78    '['.repeat(100000) + ']'.repeat(100000) + 'a',
79  ];
80  invalidServers.forEach((serv) => {
81    assert.throws(
82      () => {
83        dns.setServers([serv]);
84      },
85      {
86        name: 'TypeError',
87        code: 'ERR_INVALID_IP_ADDRESS'
88      }
89    );
90  });
91}
92
93const goog = [
94  '8.8.8.8',
95  '8.8.4.4',
96];
97dns.setServers(goog);
98assert.deepStrictEqual(dns.getServers(), goog);
99assert.throws(() => dns.setServers(['foobar']), {
100  code: 'ERR_INVALID_IP_ADDRESS',
101  name: 'TypeError',
102  message: 'Invalid IP address: foobar'
103});
104assert.throws(() => dns.setServers(['127.0.0.1:va']), {
105  code: 'ERR_INVALID_IP_ADDRESS',
106  name: 'TypeError',
107  message: 'Invalid IP address: 127.0.0.1:va'
108});
109assert.deepStrictEqual(dns.getServers(), goog);
110
111const goog6 = [
112  '2001:4860:4860::8888',
113  '2001:4860:4860::8844',
114];
115dns.setServers(goog6);
116assert.deepStrictEqual(dns.getServers(), goog6);
117
118goog6.push('4.4.4.4');
119dns.setServers(goog6);
120assert.deepStrictEqual(dns.getServers(), goog6);
121
122const ports = [
123  '4.4.4.4:53',
124  '[2001:4860:4860::8888]:53',
125  '103.238.225.181:666',
126  '[fe80::483a:5aff:fee6:1f04]:666',
127  '[fe80::483a:5aff:fee6:1f04]',
128];
129const portsExpected = [
130  '4.4.4.4',
131  '2001:4860:4860::8888',
132  '103.238.225.181:666',
133  '[fe80::483a:5aff:fee6:1f04]:666',
134  'fe80::483a:5aff:fee6:1f04',
135];
136dns.setServers(ports);
137assert.deepStrictEqual(dns.getServers(), portsExpected);
138
139dns.setServers([]);
140assert.deepStrictEqual(dns.getServers(), []);
141
142{
143  const errObj = {
144    code: 'ERR_INVALID_ARG_TYPE',
145    name: 'TypeError',
146    message: 'The "rrtype" argument must be of type string. ' +
147             'Received an instance of Array'
148  };
149  assert.throws(() => {
150    dns.resolve('example.com', [], common.mustNotCall());
151  }, errObj);
152  assert.throws(() => {
153    dnsPromises.resolve('example.com', []);
154  }, errObj);
155}
156{
157  const errObj = {
158    code: 'ERR_INVALID_ARG_TYPE',
159    name: 'TypeError',
160    message: 'The "name" argument must be of type string. ' +
161             'Received undefined'
162  };
163  assert.throws(() => {
164    dnsPromises.resolve();
165  }, errObj);
166}
167
168// dns.lookup should accept only falsey and string values
169{
170  const errorReg = {
171    code: 'ERR_INVALID_ARG_TYPE',
172    name: 'TypeError',
173    message: /^The "hostname" argument must be of type string\. Received .*/
174  };
175
176  assert.throws(() => dns.lookup({}, common.mustNotCall()), errorReg);
177
178  assert.throws(() => dns.lookup([], common.mustNotCall()), errorReg);
179
180  assert.throws(() => dns.lookup(true, common.mustNotCall()), errorReg);
181
182  assert.throws(() => dns.lookup(1, common.mustNotCall()), errorReg);
183
184  assert.throws(() => dns.lookup(common.mustNotCall(), common.mustNotCall()),
185                errorReg);
186
187  assert.throws(() => dnsPromises.lookup({}), errorReg);
188  assert.throws(() => dnsPromises.lookup([]), errorReg);
189  assert.throws(() => dnsPromises.lookup(true), errorReg);
190  assert.throws(() => dnsPromises.lookup(1), errorReg);
191  assert.throws(() => dnsPromises.lookup(common.mustNotCall()), errorReg);
192}
193
194// dns.lookup should accept falsey values
195{
196  const checkCallback = (err, address, family) => {
197    assert.ifError(err);
198    assert.strictEqual(address, null);
199    assert.strictEqual(family, 4);
200  };
201
202  ['', null, undefined, 0, NaN].forEach(async (value) => {
203    const res = await dnsPromises.lookup(value);
204    assert.deepStrictEqual(res, { address: null, family: 4 });
205    dns.lookup(value, common.mustCall(checkCallback));
206  });
207}
208
209{
210  // Make sure that dns.lookup throws if hints does not represent a valid flag.
211  // (dns.V4MAPPED | dns.ADDRCONFIG | dns.ALL) + 1 is invalid because:
212  // - it's different from dns.V4MAPPED and dns.ADDRCONFIG and dns.ALL.
213  // - it's different from any subset of them bitwise ored.
214  // - it's different from 0.
215  // - it's an odd number different than 1, and thus is invalid, because
216  // flags are either === 1 or even.
217  const hints = (dns.V4MAPPED | dns.ADDRCONFIG | dns.ALL) + 1;
218  const err = {
219    code: 'ERR_INVALID_OPT_VALUE',
220    name: 'TypeError',
221    message: /The value "\d+" is invalid for option "hints"/
222  };
223
224  assert.throws(() => {
225    dnsPromises.lookup('nodejs.org', { hints });
226  }, err);
227  assert.throws(() => {
228    dns.lookup('nodejs.org', { hints }, common.mustNotCall());
229  }, err);
230}
231
232assert.throws(() => dns.lookup('nodejs.org'), {
233  code: 'ERR_INVALID_CALLBACK',
234  name: 'TypeError'
235});
236
237assert.throws(() => dns.lookup('nodejs.org', 4), {
238  code: 'ERR_INVALID_CALLBACK',
239  name: 'TypeError'
240});
241
242dns.lookup('', { family: 4, hints: 0 }, common.mustCall());
243
244dns.lookup('', {
245  family: 6,
246  hints: dns.ADDRCONFIG
247}, common.mustCall());
248
249dns.lookup('', { hints: dns.V4MAPPED }, common.mustCall());
250
251dns.lookup('', {
252  hints: dns.ADDRCONFIG | dns.V4MAPPED
253}, common.mustCall());
254
255dns.lookup('', {
256  hints: dns.ALL
257}, common.mustCall());
258
259dns.lookup('', {
260  hints: dns.V4MAPPED | dns.ALL
261}, common.mustCall());
262
263dns.lookup('', {
264  hints: dns.ADDRCONFIG | dns.V4MAPPED | dns.ALL
265}, common.mustCall());
266
267(async function() {
268  await dnsPromises.lookup('', { family: 4, hints: 0 });
269  await dnsPromises.lookup('', { family: 6, hints: dns.ADDRCONFIG });
270  await dnsPromises.lookup('', { hints: dns.V4MAPPED });
271  await dnsPromises.lookup('', { hints: dns.ADDRCONFIG | dns.V4MAPPED });
272  await dnsPromises.lookup('', { hints: dns.ALL });
273  await dnsPromises.lookup('', { hints: dns.V4MAPPED | dns.ALL });
274  await dnsPromises.lookup('', {
275    hints: dns.ADDRCONFIG | dns.V4MAPPED | dns.ALL
276  });
277})().then(common.mustCall());
278
279{
280  const err = {
281    code: 'ERR_MISSING_ARGS',
282    name: 'TypeError',
283    message: 'The "address", "port", and "callback" arguments must be ' +
284    'specified'
285  };
286
287  assert.throws(() => dns.lookupService('0.0.0.0'), err);
288  err.message = 'The "address" and "port" arguments must be specified';
289  assert.throws(() => dnsPromises.lookupService('0.0.0.0'), err);
290}
291
292{
293  const invalidAddress = 'fasdfdsaf';
294  const err = {
295    code: 'ERR_INVALID_OPT_VALUE',
296    name: 'TypeError',
297    message: `The value "${invalidAddress}" is invalid for option "address"`
298  };
299
300  assert.throws(() => {
301    dnsPromises.lookupService(invalidAddress, 0);
302  }, err);
303
304  assert.throws(() => {
305    dns.lookupService(invalidAddress, 0, common.mustNotCall());
306  }, err);
307}
308
309const portErr = (port) => {
310  const err = {
311    code: 'ERR_SOCKET_BAD_PORT',
312    message:
313      `Port should be >= 0 and < 65536. Received ${port}.`,
314    name: 'RangeError'
315  };
316
317  assert.throws(() => {
318    dnsPromises.lookupService('0.0.0.0', port);
319  }, err);
320
321  assert.throws(() => {
322    dns.lookupService('0.0.0.0', port, common.mustNotCall());
323  }, err);
324};
325portErr(null);
326portErr(undefined);
327portErr(65538);
328portErr('test');
329
330assert.throws(() => {
331  dns.lookupService('0.0.0.0', 80, null);
332}, {
333  code: 'ERR_INVALID_CALLBACK',
334  name: 'TypeError'
335});
336
337{
338  dns.resolveMx('foo.onion', function(err) {
339    assert.deepStrictEqual(err.code, 'ENOTFOUND');
340    assert.deepStrictEqual(err.syscall, 'queryMx');
341    assert.deepStrictEqual(err.hostname, 'foo.onion');
342    assert.deepStrictEqual(err.message, 'queryMx ENOTFOUND foo.onion');
343  });
344}
345
346{
347  const cases = [
348    { method: 'resolveAny',
349      answers: [
350        { type: 'A', address: '1.2.3.4', ttl: 3333333333 },
351        { type: 'AAAA', address: '::42', ttl: 3333333333 },
352        { type: 'MX', priority: 42, exchange: 'foobar.com', ttl: 3333333333 },
353        { type: 'NS', value: 'foobar.org', ttl: 3333333333 },
354        { type: 'PTR', value: 'baz.org', ttl: 3333333333 },
355        {
356          type: 'SOA',
357          nsname: 'ns1.example.com',
358          hostmaster: 'admin.example.com',
359          serial: 3210987654,
360          refresh: 900,
361          retry: 900,
362          expire: 1800,
363          minttl: 3333333333
364        },
365      ] },
366
367    { method: 'resolve4',
368      options: { ttl: true },
369      answers: [ { type: 'A', address: '1.2.3.4', ttl: 3333333333 } ] },
370
371    { method: 'resolve6',
372      options: { ttl: true },
373      answers: [ { type: 'AAAA', address: '::42', ttl: 3333333333 } ] },
374
375    { method: 'resolveSoa',
376      answers: [
377        {
378          type: 'SOA',
379          nsname: 'ns1.example.com',
380          hostmaster: 'admin.example.com',
381          serial: 3210987654,
382          refresh: 900,
383          retry: 900,
384          expire: 1800,
385          minttl: 3333333333
386        },
387      ] },
388  ];
389
390  const server = dgram.createSocket('udp4');
391
392  server.on('message', common.mustCall((msg, { address, port }) => {
393    const parsed = dnstools.parseDNSPacket(msg);
394    const domain = parsed.questions[0].domain;
395    assert.strictEqual(domain, 'example.org');
396
397    server.send(dnstools.writeDNSPacket({
398      id: parsed.id,
399      questions: parsed.questions,
400      answers: cases[0].answers.map(
401        (answer) => Object.assign({ domain }, answer)
402      ),
403    }), port, address);
404  }, cases.length * 2));
405
406  server.bind(0, common.mustCall(() => {
407    const address = server.address();
408    dns.setServers([`127.0.0.1:${address.port}`]);
409
410    function validateResults(res) {
411      if (!Array.isArray(res))
412        res = [res];
413
414      assert.deepStrictEqual(res.map(tweakEntry),
415                             cases[0].answers.map(tweakEntry));
416    }
417
418    function tweakEntry(r) {
419      const ret = { ...r };
420
421      const { method } = cases[0];
422
423      // TTL values are only provided for A and AAAA entries.
424      if (!['A', 'AAAA'].includes(ret.type) && !/^resolve(4|6)?$/.test(method))
425        delete ret.ttl;
426
427      if (method !== 'resolveAny')
428        delete ret.type;
429
430      return ret;
431    }
432
433    (async function nextCase() {
434      if (cases.length === 0)
435        return server.close();
436
437      const { method, options } = cases[0];
438
439      validateResults(await dnsPromises[method]('example.org', options));
440
441      dns[method]('example.org', options, common.mustSucceed((res) => {
442        validateResults(res);
443        cases.shift();
444        nextCase();
445      }));
446    })().then(common.mustCall());
447
448  }));
449}
450