tls: add localAddress and localPort properties

Add localAddress and localPort properties to tls.CleartextStream.
Like remoteAddress and localPort, delegate to the backing net.Socket
object.

Refs nodejs#5502.

doc/api/tls.markdown

@@ -557,6 +557,14 @@ The string representation of the remote IP address. For example,
 
 The numeric representation of the remote port. For example, `443`.
 
+### cleartextStream.localAddress
+
+The string representation of the local IP address.
+
+### cleartextStream.localPort
+
+The numeric representation of the local port.
+
 [OpenSSL cipher list format documentation]: http://www.openssl.org/docs/apps/ciphers.html#CIPHER_LIST_FORMAT
 [BEAST attacks]: http://blog.ivanristic.com/2011/10/mitigating-the-beast-attack-on-tls.html
 [CleartextStream]: #tls_class_tls_cleartextstream

lib/tls.js

@@ -695,6 +695,17 @@ CleartextStream.prototype.__defineGetter__('remotePort', function() {
   return this.socket && this.socket.remotePort;
 });
 
+
+CleartextStream.prototype.__defineGetter__('localAddress', function() {
+  return this.socket && this.socket.localAddress;
+});
+
+
+CleartextStream.prototype.__defineGetter__('localPort', function() {
+  return this.socket && this.socket.localPort;
+});
+
+
 function EncryptedStream(pair, options) {
   CryptoStream.call(this, pair, options);
 }

test/simple/test-tls-remote.js

@@ -41,6 +41,9 @@ var server = tls.Server(options, function(s) {
 
   assert.equal(s.remoteAddress, s.socket.remoteAddress);
   assert.equal(s.remotePort, s.socket.remotePort);
+
+  assert.equal(s.localAddress, s.socket.localAddress);
+  assert.equal(s.localPort, s.socket.localPort);
   s.end();
 });