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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.common.network;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.Constants;
import java.io.IOException;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.util.function.Predicate;
import java.util.stream.Collectors;
/**
* Utilities for network interfaces / addresses binding and publishing.
* Its only intended for that purpose, not general purpose usage!!!!
*/
public abstract class NetworkUtils {
/** no instantiation */
private NetworkUtils() {}
/**
* By default we bind to any addresses on an interface/name, unless restricted by :ipv4 etc.
* This property is unrelated to that, this is about what we *publish*. Today the code pretty much
* expects one address so this is used for the sort order.
* @deprecated transition mechanism only
*/
@Deprecated
static final boolean PREFER_V6 = Boolean.parseBoolean(System.getProperty("java.net.preferIPv6Addresses", "false"));
/**
* True if we can bind to a v6 address. Its silly, but for *binding* we have a need to know
* if the stack works. this can prevent scary noise on IPv4-only hosts.
* @deprecated transition mechanism only, do not use
*/
@Deprecated
public static final boolean SUPPORTS_V6;
static {
boolean v = false;
try {
for (NetworkInterface nic : getInterfaces()) {
for (InetAddress address : Collections.list(nic.getInetAddresses())) {
if (address instanceof Inet6Address) {
v = true;
break;
}
}
}
} catch (SecurityException | SocketException misconfiguration) {
v = true; // be optimistic, you misconfigure, then you get noise to your screen
}
SUPPORTS_V6 = v;
}
/** Sorts an address by preference. This way code like publishing can just pick the first one */
static int sortKey(InetAddress address, boolean prefer_v6) {
int key = address.getAddress().length;
if (prefer_v6) {
key = -key;
}
if (address.isAnyLocalAddress()) {
key += 5;
}
if (address.isMulticastAddress()) {
key += 4;
}
if (address.isLoopbackAddress()) {
key += 3;
}
if (address.isLinkLocalAddress()) {
key += 2;
}
if (address.isSiteLocalAddress()) {
key += 1;
}
return key;
}
/**
* Sorts addresses by order of preference. This is used to pick the first one for publishing
* @deprecated remove this when multihoming is really correct
*/
@Deprecated
// only public because of silly multicast
public static void sortAddresses(List list) {
Collections.sort(list, new Comparator() {
@Override
public int compare(InetAddress left, InetAddress right) {
int cmp = Integer.compare(sortKey(left, PREFER_V6), sortKey(right, PREFER_V6));
if (cmp == 0) {
cmp = new BytesRef(left.getAddress()).compareTo(new BytesRef(right.getAddress()));
}
return cmp;
}
});
}
/** Return all interfaces (and subinterfaces) on the system */
static List getInterfaces() throws SocketException {
List all = new ArrayList<>();
addAllInterfaces(all, Collections.list(NetworkInterface.getNetworkInterfaces()));
Collections.sort(all, new Comparator() {
@Override
public int compare(NetworkInterface left, NetworkInterface right) {
return Integer.compare(left.getIndex(), right.getIndex());
}
});
return all;
}
/** Helper for getInterfaces, recursively adds subinterfaces to {@code target} */
private static void addAllInterfaces(List target, List level) {
if (level.isEmpty() == false) {
target.addAll(level);
for (NetworkInterface intf : level) {
addAllInterfaces(target, Collections.list(intf.getSubInterfaces()));
}
}
}
/** Returns system default for SO_REUSEADDR */
public static boolean defaultReuseAddress() {
return Constants.WINDOWS ? false : true;
}
private static InetAddress[] filterAllAddresses(final Predicate predicate, final String message) throws IOException {
final List interfaces = getInterfaces();
final List list = new ArrayList<>();
for (final NetworkInterface intf : interfaces) {
for (final InetAddress address : Collections.list(intf.getInetAddresses())) {
if (predicate.test(address) && isUp(intf)) {
list.add(address);
}
}
}
if (list.isEmpty()) {
throw new IllegalArgumentException(message + ", got " + interfaces);
}
return list.toArray(new InetAddress[0]);
}
private static boolean isUp(final NetworkInterface intf) throws IOException {
try {
return intf.isUp();
} catch (final SocketException e) {
// virtual ethernet devices come and go, we will treat such a device that disappeared as not being up
if (intf.getName().startsWith("veth") && e.getMessage().equals("No such device (getFlags() failed)")) {
return false;
}
throw new IOException("failed to check if interface [" + intf.getName() + "] is up", e);
}
}
/** Returns all interface-local scope (loopback) addresses for interfaces that are up. */
static InetAddress[] getLoopbackAddresses() throws IOException {
return filterAllAddresses(InetAddress::isLoopbackAddress, "no up-and-running loopback addresses found");
}
/** Returns all site-local scope (private) addresses for interfaces that are up. */
static InetAddress[] getSiteLocalAddresses() throws IOException {
return filterAllAddresses(InetAddress::isSiteLocalAddress, "No up-and-running site-local (private) addresses found");
}
/** Returns all global scope addresses for interfaces that are up. */
static InetAddress[] getGlobalAddresses() throws IOException {
return filterAllAddresses(
address -> address.isLoopbackAddress() == false
&& address.isSiteLocalAddress() == false
&& address.isLinkLocalAddress() == false,
"no up-and-running global-scope (public) addresses found"
);
}
/** Returns all addresses (any scope) for interfaces that are up.
* This is only used to pick a publish address, when the user set network.host to a wildcard */
public static InetAddress[] getAllAddresses() throws IOException {
return filterAllAddresses(address -> true, "no up-and-running addresses found");
}
static Optional maybeGetInterfaceByName(List networkInterfaces, String name) {
return networkInterfaces.stream().filter(netIf -> name.equals(netIf.getName())).findFirst();
}
/** Returns addresses for the given interface (it must be marked up) */
static InetAddress[] getAddressesForInterface(String settingValue, String suffix, String interfaceName) throws SocketException {
Optional networkInterface = maybeGetInterfaceByName(getInterfaces(), interfaceName);
if (networkInterface.isPresent() == false) {
throw new IllegalArgumentException(
"setting ["
+ settingValue
+ "] matched no network interfaces; valid values include ["
+ getInterfaces().stream()
.map(otherInterface -> "_" + otherInterface.getName() + suffix + "_")
.collect(Collectors.joining(", "))
+ "]"
);
}
if (networkInterface.get().isUp() == false) {
throw new IllegalArgumentException(
"setting ["
+ settingValue
+ "] matched network interface ["
+ networkInterface.get().getName()
+ "] but this interface is not up and running"
);
}
List list = Collections.list(networkInterface.get().getInetAddresses());
if (list.isEmpty()) {
throw new IllegalArgumentException(
"setting ["
+ settingValue
+ "] matched network interface ["
+ networkInterface.get().getName()
+ "] but this interface has no internet addresses"
);
}
return list.toArray(new InetAddress[list.size()]);
}
/** Returns only the IPV4 addresses in {@code addresses} */
static InetAddress[] filterIPV4(InetAddress addresses[]) {
List list = new ArrayList<>();
for (InetAddress address : addresses) {
if (address instanceof Inet4Address) {
list.add(address);
}
}
if (list.isEmpty()) {
throw new IllegalArgumentException("No ipv4 addresses found in " + Arrays.toString(addresses));
}
return list.toArray(new InetAddress[list.size()]);
}
/** Returns only the IPV6 addresses in {@code addresses} */
static InetAddress[] filterIPV6(InetAddress addresses[]) {
List list = new ArrayList<>();
for (InetAddress address : addresses) {
if (address instanceof Inet6Address) {
list.add(address);
}
}
if (list.isEmpty()) {
throw new IllegalArgumentException("No ipv6 addresses found in " + Arrays.toString(addresses));
}
return list.toArray(new InetAddress[list.size()]);
}
/**
* @return all IPv4 addresses for interfaces that are up.
*/
public static InetAddress[] getAllIPV4Addresses() throws IOException {
return filterIPV4(getAllAddresses());
}
/**
* @return all IPv6 addresses for interfaces that are up.
*/
public static InetAddress[] getAllIPV6Addresses() throws IOException {
return filterIPV6(getAllAddresses());
}
}
