net: add lookup option to Socket.prototype.connect

Allows customization of the lookup function used when
Socket.prototype.connect is called using a hostname.

PR-URL: https://github.com/iojs/io.js/pull/1505
Reviewed-By: Chris Dickinson <christopher.s.dickinson@gmail.com>
Reviewed-By: Yosuke Furukawa <yosuke.furukawa@gmail.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/test/parallel/test-net-dns-custom-lookup.js b/test/parallel/test-net-dns-custom-lookup.js
new file mode 100644
index 0000000000..3979bbf0b6
--- /dev/null
+++ b/test/parallel/test-net-dns-custom-lookup.js
@@ -0,0 +1,40 @@
+var common = require('../common');
+var assert = require('assert');
+var net = require('net');
+var dns = require('dns');
+var ok = false;
+
+function check(addressType, cb) {
+  var server = net.createServer(function(client) {
+    client.end();
+    server.close();
+    cb && cb();
+  });
+
+  var address = addressType === 4 ? '127.0.0.1' : '::1';
+  server.listen(common.PORT, address, function() {
+    net.connect({
+      port: common.PORT,
+      host: 'localhost',
+      lookup: lookup
+    }).on('lookup', function(err, ip, type) {
+      assert.equal(err, null);
+      assert.equal(ip, address);
+      assert.equal(type, addressType);
+      ok = true;
+    });
+  });
+
+  function lookup(host, dnsopts, cb) {
+    dnsopts.family = addressType;
+    dns.lookup(host, dnsopts, cb);
+  }
+}
+
+check(4, function() {
+  common.hasIPv6 && check(6);
+});
+
+process.on('exit', function() {
+  assert.ok(ok);
+});