Test that stray HelloRequests during the handshake are ignored.

Change-Id: I79e21ffce9c2d7f47b055b75bd00b80aafa8b8f0
Reviewed-on: https://boringssl-review.googlesource.com/8668
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/ssl/test/runner/conn.go b/ssl/test/runner/conn.go
index 601c731..7628c0f 100644
--- a/ssl/test/runner/conn.go
+++ b/ssl/test/runner/conn.go
@@ -945,9 +945,18 @@
 		return c.dtlsWriteRecord(typ, data)
 	}
 
-	if c.config.Bugs.PackHandshakeFlight && typ == recordTypeHandshake {
-		c.pendingFlight.Write(data)
-		return len(data), nil
+	if typ == recordTypeHandshake {
+		if c.config.Bugs.SendHelloRequestBeforeEveryHandshakeMessage {
+			newData := make([]byte, 0, 4+len(data))
+			newData = append(newData, typeHelloRequest, 0, 0, 0)
+			newData = append(newData, data...)
+			data = newData
+		}
+
+		if c.config.Bugs.PackHandshakeFlight {
+			c.pendingFlight.Write(data)
+			return len(data), nil
+		}
 	}
 
 	return c.doWriteRecord(typ, data)