tls: add getProtocol() to TLS sockets

This commit adds a new method for TLS sockets that returns the
negotiated protocol version.

PR-URL: https://github.com/nodejs/node/pull/4995
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/test/parallel/test-tls-getprotocol.js b/test/parallel/test-tls-getprotocol.js
new file mode 100644
index 0000000000..67592143ee
--- /dev/null
+++ b/test/parallel/test-tls-getprotocol.js
@@ -0,0 +1,43 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+
+if (!common.hasCrypto) {
+  console.log('1..0 # Skipped: missing crypto');
+  return;
+}
+
+const tls = require('tls');
+const fs = require('fs');
+
+const clientConfigs = [
+  { secureProtocol: 'TLSv1_method', version: 'TLSv1' },
+  { secureProtocol: 'TLSv1_1_method', version: 'TLSv1.1' },
+  { secureProtocol: 'TLSv1_2_method', version: 'TLSv1.2' }
+];
+
+const serverConfig = {
+  key: fs.readFileSync(common.fixturesDir + '/keys/agent2-key.pem'),
+  cert: fs.readFileSync(common.fixturesDir + '/keys/agent2-cert.pem')
+};
+
+const server = tls.createServer(serverConfig, common.mustCall(function() {
+
+}, clientConfigs.length)).listen(common.PORT, common.localhostIPv4, function() {
+  let connected = 0;
+  clientConfigs.forEach(function(v) {
+    tls.connect({
+      host: common.localhostIPv4,
+      port: common.PORT,
+      rejectUnauthorized: false,
+      secureProtocol: v.secureProtocol
+    }, common.mustCall(function() {
+      assert.strictEqual(this.getProtocol(), v.version);
+      this.on('end', common.mustCall(function() {
+        assert.strictEqual(this.getProtocol(), null);
+      })).end();
+      if (++connected === clientConfigs.length)
+        server.close();
+    }));
+  });
+});