/*
 * 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.
 *
 */

package org.apache.jmeter.engine;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.UnknownHostException;
import java.util.Collections;
import java.util.stream.Collectors;

import org.junit.Assert;
import org.junit.Test;

/**
 * Try to establish why some batchtestserver runs fail 
 */
public class LocalHostTest {

    @Test
    public void testInterfaces() throws Exception {
        String interfaces = Collections
                .list(NetworkInterface.getNetworkInterfaces()).stream()
                .map(this::ifaceWithAddresses)
                .collect(Collectors.joining(", "));
        perr("Interfaces: {" + interfaces + "}");
        InetAddress localHost = getLocalHost();
        boolean localHostIsBound = Collections.list(NetworkInterface.getNetworkInterfaces()).stream()
                .flatMap(iface -> Collections.list(iface.getInetAddresses())
                        .stream())
                .filter(addr -> addr.equals(localHost))
                .findFirst()
                .isPresent();
        Assert.assertTrue("localHost: " + localHost + " is bound to an interface", localHostIsBound);
    }

    private String ifaceWithAddresses(NetworkInterface iface) {
        return iface + " => ["
                + Collections.list(iface.getInetAddresses()).stream()
                        .map(InetAddress::toString)
                        .collect(Collectors.joining(", "))
                + "]";
    }

    @Test
    public void testLocalHost() throws Exception {
        InetAddress localHost = getLocalHost();
        showAddress(localHost);
        showAddress(InetAddress.getByName("localhost"));
        for (InetAddress a : InetAddress.getAllByName(InetAddress.getLocalHost().getHostName())) {
            perr("====================");
            showAddress(a);            
        }
    }

    private InetAddress getLocalHost() throws UnknownHostException {
        final String key = "java.rmi.server.hostname";
        String host = System.getProperties().getProperty(key); // $NON-NLS-1$
        perr(key + "=" + host);
        InetAddress localHost;
        if( host==null ) {
            localHost = InetAddress.getLocalHost();
        } else {
            localHost = InetAddress.getByName(host);
        }
        return localHost;
    }

    private static void showAddress(InetAddress localHost) {
        perr(localHost);
        perr("isSiteLocalAddress:"+localHost.isSiteLocalAddress());
        perr("isAnyLocalAddress:"+localHost.isAnyLocalAddress());
        perr("isLinkLocalAddress:"+localHost.isLinkLocalAddress());
        perr("isLoopbackAddress:"+localHost.isLoopbackAddress());
        perr("isMulticastAddress:"+localHost.isMulticastAddress());
    }

    private static void perr(Object s) {
        System.err.println(s);
    }

}

@@ -861,16 +861,50 @@
 ddress;%0A
+import java.net.InterfaceAddress;%0A
 import j
@@ -1034,16 +1034,123 @@
 ctors;%0A%0A
+import org.apache.commons.net.util.SubnetUtils;%0Aimport org.apache.commons.net.util.SubnetUtils.SubnetInfo;%0A
 import o
@@ -1611,35 +1611,30 @@
 %22);%0A        
-InetAddress
+String
  localHost =
@@ -1640,32 +1640,49 @@
 = getLocalHost()
+.getHostAddress()
 ;%0A        boolea
@@ -1709,24 +1709,41 @@
  Collections
+%0A                
 .list(Networ
@@ -1820,33 +1820,16 @@
 face -%3E 
-Collections.list(
 iface.ge
@@ -1823,34 +1823,39 @@
 e -%3E iface.getIn
-e
 t
+erface
 Addresses())%0A   
@@ -1849,16 +1849,25 @@
 resses()
+.stream()
 )%0A      
@@ -1880,26 +1880,95 @@
     
-        .stream())
+.filter(iface -%3E iface.getNetworkPrefixLength() %3C= 32) // hack to prevent checking IPv6
 %0A   
@@ -1981,22 +1981,19 @@
        .
-filter
+map
 (addr -%3E
@@ -1997,19 +1997,86 @@
  -%3E 
-addr.equals
+toSubnetInfo(addr))%0A                .filter(subnetInfo -%3E subnetInfo.isInRange
 (loc
@@ -2169,16 +2169,33 @@
 ertTrue(
+%0A                
 %22localHo
@@ -2242,16 +2242,32 @@
 erface%22,
+%0A               
  localHo
@@ -2277,32 +2277,258 @@
 sBound);%0A    %7D%0A%0A
+    private SubnetInfo toSubnetInfo(InterfaceAddress addr) %7B%0A        return new SubnetUtils(%0A                addr.getAddress().getHostAddress() + %22/%22 + addr.getNetworkPrefixLength())%0A                        .getInfo();%0A    %7D%0A%0A
     private Stri
@@ -2628,25 +2628,8 @@
   + 
-Collections.list(
 ifac
@@ -2635,18 +2635,23 @@
 ce.getIn
-e
 t
+erface
 Addresse
@@ -2649,25 +2649,24 @@
 eAddresses()
-)
 .stream()%0A  
@@ -2694,18 +2694,23 @@
  .map(In
-e
 t
+erface
 Address:

Check if the bound networks contain the "localhost" address