tls: handle SSL_ERROR_ZERO_RETURN

see #5004

Author: indutny

lib/tls.js

@@ -922,9 +922,13 @@ SecurePair.prototype.error = function(returnOnly) {
   this.ssl.error = null;
 
   if (!this._secureEstablished) {
-    if (!err) {
-      err = new Error('socket hang up');
-      err.code = 'ECONNRESET';
+    // Emit ECONNRESET instead of zero return
+    if (!err || err.message === 'ZERO_RETURN') {
+      var connReset = new Error('socket hang up');
+      connReset.code = 'ECONNRESET';
+      connReset.sslError = err && err.message;
+
+      err = connReset;
     }
     this.destroy();
     if (!returnOnly) this.emit('error', err);

src/node_crypto.cc

@@ -927,6 +927,11 @@ int Connection::HandleSSLError(const char* func, int rv, ZeroStatus zs) {
     DEBUG_PRINT("[%p] SSL: %s want read\n", ssl_, func);
     return 0;
 
+  } else if (err == SSL_ERROR_ZERO_RETURN) {
+    handle_->Set(String::New("error"),
+                 Exception::Error(String::New("ZERO_RETURN")));
+    return rv;
+
   } else {
     HandleScope scope;
     BUF_MEM* mem;