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net: support DNS hints in createConnection()

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This commit adds support for passing DNS lookup hints to
createConnection().

PR-URL: https://github.com/nodejs/node/pull/6000
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
This commit is contained in:
Colin Ihrig 2016-04-01 16:59:09 -04:00 committed by cjihrig
parent d939152230
commit 39de601e1c
3 changed files with 16 additions and 8 deletions
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3
doc/api/net.markdown
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@ -375,6 +375,8 @@ For TCP sockets, `options` argument should be an object which specifies:
- `family` : Version of IP stack. Defaults to `4`.
- `hints`: [`dns.lookup()` hints][]. Defaults to `0`.
- `lookup` : Custom lookup function. Defaults to `dns.lookup`.
For local domain sockets, `options` argument should be an object which
@ -720,6 +722,7 @@ Returns true if input is a version 6 IP address, otherwise returns false.
[`connect()`]: #net_socket_connect_options_connectlistener
[`destroy()`]: #net_socket_destroy
[`dns.lookup()`]: dns.html#dns_dns_lookup_hostname_options_callback
[`dns.lookup()` hints]: #dns_supported_getaddrinfo_flags
[`end()`]: #net_socket_end_data_encoding
[`EventEmitter`]: events.html#events_class_events_eventemitter
[`net.Socket`]: #net_class_net_socket

4
lib/net.js
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@ -946,10 +946,10 @@ function lookupAndConnect(self, options) {
var dnsopts = {
family: options.family,
hints: 0
hints: options.hints || 0
};
if (dnsopts.family !== 4 && dnsopts.family !== 6) {
if (dnsopts.family !== 4 && dnsopts.family !== 6 && dnsopts.hints === 0) {
dnsopts.hints = dns.ADDRCONFIG;
// The AI_V4MAPPED hint is not supported on FreeBSD or Android,
// and getaddrinfo returns EAI_BADFLAGS. However, it seems to be

17
test/parallel/test-net-create-connection.js
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@ -1,14 +1,15 @@
'use strict';
var common = require('../common');
var assert = require('assert');
var net = require('net');
const common = require('../common');
const assert = require('assert');
const dns = require('dns');
const net = require('net');
var tcpPort = common.PORT;
var expectedConnections = 7;
const tcpPort = common.PORT;
const expectedConnections = 7;
var clientConnected = 0;
var serverConnected = 0;
var server = net.createServer(function(socket) {
const server = net.createServer(function(socket) {
socket.end();
if (++serverConnected === expectedConnections) {
server.close();
@ -87,6 +88,10 @@ server.listen(tcpPort, 'localhost', function() {
fail({
port: 65536
}, RangeError, '"port" option should be >= 0 and < 65536: 65536');
fail({
hints: (dns.ADDRCONFIG | dns.V4MAPPED) + 42,
}, TypeError, 'Invalid argument: hints must use valid flags');
});
// Try connecting to random ports, but do so once the server is closed