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/*
* Copyright 2020 The Netty Project
*
* The Netty Project 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:
*
* https://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 io.netty.util;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.SocketUtils;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
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.Enumeration;
import java.util.List;
final class NetUtilInitializations {
/**
* The logger being used by this class
*/
private static final InternalLogger logger = InternalLoggerFactory.getInstance(NetUtilInitializations.class);
private NetUtilInitializations() {
}
static Inet4Address createLocalhost4() {
byte[] LOCALHOST4_BYTES = {127, 0, 0, 1};
Inet4Address localhost4 = null;
try {
localhost4 = (Inet4Address) InetAddress.getByAddress("localhost", LOCALHOST4_BYTES);
} catch (Exception e) {
// We should not get here as long as the length of the address is correct.
PlatformDependent.throwException(e);
}
return localhost4;
}
static Inet6Address createLocalhost6() {
byte[] LOCALHOST6_BYTES = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
Inet6Address localhost6 = null;
try {
localhost6 = (Inet6Address) InetAddress.getByAddress("localhost", LOCALHOST6_BYTES);
} catch (Exception e) {
// We should not get here as long as the length of the address is correct.
PlatformDependent.throwException(e);
}
return localhost6;
}
static NetworkIfaceAndInetAddress determineLoopback(Inet4Address localhost4, Inet6Address localhost6) {
// Retrieve the list of available network interfaces.
List ifaces = new ArrayList();
try {
Enumeration interfaces = NetworkInterface.getNetworkInterfaces();
if (interfaces != null) {
while (interfaces.hasMoreElements()) {
NetworkInterface iface = interfaces.nextElement();
// Use the interface with proper INET addresses only.
if (SocketUtils.addressesFromNetworkInterface(iface).hasMoreElements()) {
ifaces.add(iface);
}
}
}
} catch (SocketException e) {
logger.warn("Failed to retrieve the list of available network interfaces", e);
}
// Find the first loopback interface available from its INET address (127.0.0.1 or ::1)
// Note that we do not use NetworkInterface.isLoopback() in the first place because it takes long time
// on a certain environment. (e.g. Windows with -Djava.net.preferIPv4Stack=true)
NetworkInterface loopbackIface = null;
InetAddress loopbackAddr = null;
loop: for (NetworkInterface iface: ifaces) {
for (Enumeration i = SocketUtils.addressesFromNetworkInterface(iface); i.hasMoreElements();) {
InetAddress addr = i.nextElement();
if (addr.isLoopbackAddress()) {
// Found
loopbackIface = iface;
loopbackAddr = addr;
break loop;
}
}
}
// If failed to find the loopback interface from its INET address, fall back to isLoopback().
if (loopbackIface == null) {
try {
for (NetworkInterface iface: ifaces) {
if (iface.isLoopback()) {
Enumeration i = SocketUtils.addressesFromNetworkInterface(iface);
if (i.hasMoreElements()) {
// Found the one with INET address.
loopbackIface = iface;
loopbackAddr = i.nextElement();
break;
}
}
}
if (loopbackIface == null) {
logger.warn("Failed to find the loopback interface");
}
} catch (SocketException e) {
logger.warn("Failed to find the loopback interface", e);
}
}
if (loopbackIface != null) {
// Found the loopback interface with an INET address.
logger.debug(
"Loopback interface: {} ({}, {})",
loopbackIface.getName(), loopbackIface.getDisplayName(), loopbackAddr.getHostAddress());
} else {
// Could not find the loopback interface, but we can't leave LOCALHOST as null.
// Use LOCALHOST6 or LOCALHOST4, preferably the IPv6 one.
if (loopbackAddr == null) {
try {
if (NetworkInterface.getByInetAddress(localhost6) != null) {
logger.debug("Using hard-coded IPv6 localhost address: {}", localhost6);
loopbackAddr = localhost6;
}
} catch (Exception e) {
// Ignore
} finally {
if (loopbackAddr == null) {
logger.debug("Using hard-coded IPv4 localhost address: {}", localhost4);
loopbackAddr = localhost4;
}
}
}
}
return new NetworkIfaceAndInetAddress(loopbackIface, loopbackAddr);
}
static final class NetworkIfaceAndInetAddress {
private final NetworkInterface iface;
private final InetAddress address;
NetworkIfaceAndInetAddress(NetworkInterface iface, InetAddress address) {
this.iface = iface;
this.address = address;
}
public NetworkInterface iface() {
return iface;
}
public InetAddress address() {
return address;
}
}
}
