test: split up internet dns tests

For whatever reason, the CI win2012 machine was timing out on the
internet test-dns file. Split out ipv4 and ipv6 specific tests to
separate files so tests do not time out. (Each file is given a 60
second timeout on CI. Tests within a file are run in sequence.)

PR-URL: #2802
Fixes: #2468
Reviewed-By: Roman Reiss <me@silverwind.io>

test/internet/test-dns-ipv4.js

@@ -0,0 +1,203 @@
+'use strict';
+var common = require('../common');
+var assert = require('assert'),
+    dns = require('dns'),
+    net = require('net'),
+    isIP = net.isIP,
+    isIPv4 = net.isIPv4;
+var util = require('util');
+
+var expected = 0,
+    completed = 0,
+    running = false,
+    queue = [];
+
+function TEST(f) {
+  function next() {
+    var f = queue.shift();
+    if (f) {
+      running = true;
+      console.log(f.name);
+      f(done);
+    }
+  }
+
+  function done() {
+    running = false;
+    completed++;
+    process.nextTick(next);
+  }
+
+  expected++;
+  queue.push(f);
+
+  if (!running) {
+    next();
+  }
+}
+
+function checkWrap(req) {
+  assert.ok(typeof req === 'object');
+}
+
+TEST(function test_resolve4(done) {
+  var req = dns.resolve4('www.google.com', function(err, ips) {
+    if (err) throw err;
+
+    assert.ok(ips.length > 0);
+
+    for (var i = 0; i < ips.length; i++) {
+      assert.ok(isIPv4(ips[i]));
+    }
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+TEST(function test_reverse_ipv4(done) {
+  var req = dns.reverse('8.8.8.8', function(err, domains) {
+    if (err) throw err;
+
+    assert.ok(domains.length > 0);
+
+    for (var i = 0; i < domains.length; i++) {
+      assert.ok(domains[i]);
+      assert.ok(typeof domains[i] === 'string');
+    }
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+TEST(function test_lookup_ipv4_explicit(done) {
+  var req = dns.lookup('www.google.com', 4, function(err, ip, family) {
+    if (err) throw err;
+    assert.ok(net.isIPv4(ip));
+    assert.strictEqual(family, 4);
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+TEST(function test_lookup_ipv4_implicit(done) {
+  var req = dns.lookup('www.google.com', function(err, ip, family) {
+    if (err) throw err;
+    assert.ok(net.isIPv4(ip));
+    assert.strictEqual(family, 4);
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+TEST(function test_lookup_ipv4_explicit_object(done) {
+  var req = dns.lookup('www.google.com', {
+    family: 4
+  }, function(err, ip, family) {
+    if (err) throw err;
+    assert.ok(net.isIPv4(ip));
+    assert.strictEqual(family, 4);
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+TEST(function test_lookup_ipv4_hint_addrconfig(done) {
+  var req = dns.lookup('www.google.com', {
+    hints: dns.ADDRCONFIG
+  }, function(err, ip, family) {
+    if (err) throw err;
+    assert.ok(net.isIPv4(ip));
+    assert.strictEqual(family, 4);
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+TEST(function test_lookup_ip_ipv4(done) {
+  var req = dns.lookup('127.0.0.1', function(err, ip, family) {
+    if (err) throw err;
+    assert.strictEqual(ip, '127.0.0.1');
+    assert.strictEqual(family, 4);
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+TEST(function test_lookup_localhost_ipv4(done) {
+  var req = dns.lookup('localhost', 4, function(err, ip, family) {
+    if (err) throw err;
+    assert.strictEqual(ip, '127.0.0.1');
+    assert.strictEqual(family, 4);
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+TEST(function test_lookup_all_ipv4(done) {
+  var req = dns.lookup('www.google.com', {all: true, family: 4},
+                       function(err, ips) {
+    if (err) throw err;
+    assert.ok(Array.isArray(ips));
+    assert.ok(ips.length > 0);
+
+    ips.forEach(function(ip) {
+      assert.ok(isIPv4(ip.address));
+      assert.strictEqual(ip.family, 4);
+    });
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+TEST(function test_lookupservice_ip_ipv4(done) {
+  var req = dns.lookupService('127.0.0.1', 80, function(err, host, service) {
+    if (err) throw err;
+    assert.equal(typeof host, 'string');
+    assert(host);
+
+    /*
+     * Retrieve the actual HTTP service name as setup on the host currently
+     * running the test by reading it from /etc/services. This is not ideal,
+     * as the service name lookup could use another mechanism (e.g nscd), but
+     * it's already better than hardcoding it.
+     */
+    var httpServiceName = common.getServiceName(80, 'tcp');
+    if (!httpServiceName) {
+      /*
+       * Couldn't find service name, reverting to the most sensible default
+       * for port 80.
+       */
+      httpServiceName = 'http';
+    }
+
+    assert.strictEqual(service, httpServiceName);
+
+    done();
+  });
+
+  checkWrap(req);
+});
+
+process.on('exit', function() {
+  console.log(completed + ' tests completed');
+  assert.equal(running, false);
+  assert.strictEqual(expected, completed);
+});