tls: renegotiate should take care of its own state

In the initial version of this test there were two zero-length writes to force tls state to cycle. The second is not necessary, at least not now, but the first was. The renegotiate() API should ensure that packet exchange takes place, not its users, so move the zero-length write into tls. See: #14239 See: b1909d3a70f9 PR-URL: #25997 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: sam-github

lib/_tls_wrap.js

@@ -613,6 +613,9 @@ TLSSocket.prototype.renegotiate = function(options, callback) {
  this._requestCert = requestCert;
  this._rejectUnauthorized = rejectUnauthorized;
  }
+ // Ensure that we'll cycle through internal openssl's state
+ this.write('');
+
  if (!this._handle.renegotiate()) {
  if (callback) {
  process.nextTick(callback, new ERR_TLS_RENEGOTIATE());

test/parallel/test-tls-disable-renegotiation.js

@@ -46,7 +46,6 @@ server.listen(0, common.mustCall(() => {
  port
  };
  const client = tls.connect(options, common.mustCall(() => {
- client.write('');
  // Negotiation is still permitted for this first
  // attempt. This should succeed.
  let ok = client.renegotiate(options, common.mustCall((err) => {
@@ -56,7 +55,6 @@ server.listen(0, common.mustCall(() => {
  // data event on the server. After that data
  // is received, disableRenegotiation is called.
  client.write('data', common.mustCall(() => {
- client.write('');
  // This second renegotiation attempt should fail
  // and the callback should never be invoked. The
  // server will simply drop the connection after