Import RMIServerSocketFactoryImp from origin

The RMIServerSocketFactoryImp is the way origin handle local port
configuration.

When used, the jmx can be set to listen on local traffic only.

Signed-off-by: Amnon Heiman <amnon@scylladb.com>

src/main/java/com/scylladb/jmx/utils/RMIServerSocketFactoryImpl.java

@@ -0,0 +1,118 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * Copyright 2016 ScyllaDB
+ *
+ * Modified by ScyllaDB
+ */
+
+package com.scylladb.jmx.utils;
+
+import java.io.IOException;
+import java.lang.management.ManagementFactory;
+import java.net.*;
+import java.rmi.registry.LocateRegistry;
+import java.rmi.server.RMIServerSocketFactory;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.management.remote.JMXConnectorServer;
+import javax.management.remote.JMXServiceURL;
+import javax.management.remote.rmi.RMIConnectorServer;
+import javax.net.ServerSocketFactory;
+
+public class RMIServerSocketFactoryImpl implements RMIServerSocketFactory {
+    public static JMXConnectorServer jmxServer = null;
+
+    public static void maybeInitJmx() {
+        String jmxPort = System
+                .getProperty("com.sun.management.jmxremote.port");
+
+        if (jmxPort == null) {
+            System.out.println(
+                    "JMX is not enabled to receive remote connections.");
+
+            jmxPort = System.getProperty("cassandra.jmx.local.port", "7199");
+            String address = System.getProperty("jmx.address", "localhost");
+            if (address.equals("localhost")) {
+                System.setProperty("java.rmi.server.hostname",
+                        InetAddress.getLoopbackAddress().getHostAddress());
+            } else {
+                try {
+                    System.setProperty("java.rmi.server.hostname",
+                            InetAddress.getByName(address).getHostAddress());
+                } catch (UnknownHostException e) {
+                    // TODO Auto-generated catch block
+                    e.printStackTrace();
+                }
+
+            }
+            try {
+                RMIServerSocketFactory serverFactory = new RMIServerSocketFactoryImpl();
+                LocateRegistry.createRegistry(Integer.valueOf(jmxPort), null,
+                        serverFactory);
+
+                StringBuffer url = new StringBuffer();
+                url.append("service:jmx:");
+                url.append("rmi://").append(address).append("/jndi/");
+                url.append("rmi://").append(address).append(":").append(jmxPort)
+                        .append("/jmxrmi");
+                System.out.println(url);
+                Map env = new HashMap();
+                env.put(RMIConnectorServer.RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE,
+                        serverFactory);
+
+                jmxServer = new RMIConnectorServer(
+                        new JMXServiceURL(url.toString()), env,
+                        ManagementFactory.getPlatformMBeanServer());
+
+                jmxServer.start();
+            } catch (IOException e) {
+                System.out.println(
+                        "Error starting local jmx server: " + e.toString());
+            }
+
+        } else {
+            System.out.println(
+                    "JMX is enabled to receive remote connections on port: "
+                            + jmxPort);
+        }
+    }
+
+    public ServerSocket createServerSocket(final int pPort) throws IOException {
+        return ServerSocketFactory.getDefault().createServerSocket(pPort, 0,
+                InetAddress.getLoopbackAddress());
+    }
+
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (obj == this) {
+            return true;
+        }
+
+        return obj.getClass().equals(getClass());
+    }
+
+    public int hashCode() {
+        return RMIServerSocketFactoryImpl.class.hashCode();
+    }
+
+}