tls: add options argument to createSecurePair

Helps in implementation of nodejs#6204, where some options passed to
`createSecurePair()` are ignored before this patch.

These options are very helpful if someone wants to pass
`options.servername` or `options.SNICallback` to securepair.

PR-URL: nodejs/node#2441
Reviewed-By: Fedor Indutny <[email protected]>

doc/api/tls.markdown

@@ -661,7 +661,7 @@ publicly trusted list of CAs as given in
 <http://mxr.mozilla.org/mozilla/source/security/nss/lib/ckfw/builtins/certdata.txt>.
 
 
-## tls.createSecurePair([context][, isServer][, requestCert][, rejectUnauthorized])
+## tls.createSecurePair([context][, isServer][, requestCert][, rejectUnauthorized][, options])
 
 Creates a new secure pair object with two streams, one of which reads/writes
 encrypted data, and one reads/writes cleartext data.
@@ -680,6 +680,8 @@ and the cleartext one is used as a replacement for the initial encrypted stream.
    automatically reject clients with invalid certificates. Only applies to
    servers with `requestCert` enabled.
 
+ - `options`: An object with common SSL options. See [tls.TLSSocket][].
+
 `tls.createSecurePair()` returns a SecurePair object with `cleartext` and
 `encrypted` stream properties.
 

lib/_tls_legacy.js

@@ -763,11 +763,13 @@ function securePairNT(self, options) {
 exports.createSecurePair = function(context,
                                     isServer,
                                     requestCert,
-                                    rejectUnauthorized) {
+                                    rejectUnauthorized,
+                                    options) {
   var pair = new SecurePair(context,
                             isServer,
                             requestCert,
-                            rejectUnauthorized);
+                            rejectUnauthorized,
+                            options);
   return pair;
 };
 

test/parallel/test-tls-securepair-fiftharg.js

@@ -0,0 +1,27 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const fs = require('fs');
+const tls = require('tls');
+
+const sslcontext = tls.createSecureContext({
+  cert: fs.readFileSync(common.fixturesDir + '/test_cert.pem'),
+  key: fs.readFileSync(common.fixturesDir + '/test_key.pem')
+});
+
+var catchedServername;
+const pair = tls.createSecurePair(sslcontext, true, false, false, {
+  SNICallback: common.mustCall(function(servername, cb) {
+    catchedServername = servername;
+  })
+});
+
+// captured traffic from browser's request to https://www.google.com
+const sslHello = fs.readFileSync(common.fixturesDir + '/google_ssl_hello.bin');
+
+pair.encrypted.write(sslHello);
+
+process.on('exit', function() {
+  assert.strictEqual('www.google.com', catchedServername);
+});