io.netty.util.NetUtilInitializations Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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.Collection;
import java.util.Collections;
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 Collection networkInterfaces() {
List networkInterfaces = new ArrayList();
try {
Enumeration interfaces = NetworkInterface.getNetworkInterfaces();
if (interfaces != null) {
while (interfaces.hasMoreElements()) {
networkInterfaces.add(interfaces.nextElement());
}
}
} catch (SocketException e) {
logger.warn("Failed to retrieve the list of available network interfaces", e);
} catch (NullPointerException e) {
if (!PlatformDependent.isAndroid()) {
throw e;
}
// Might happen on earlier version of Android.
// See https://developer.android.com/reference/java/net/NetworkInterface#getNetworkInterfaces()
}
return Collections.unmodifiableList(networkInterfaces);
}
static NetworkIfaceAndInetAddress determineLoopback(
Collection networkInterfaces, Inet4Address localhost4, Inet6Address localhost6) {
// Retrieve the list of available network interfaces.
List ifaces = new ArrayList();
for (NetworkInterface iface: networkInterfaces) {
// Use the interface with proper INET addresses only.
if (SocketUtils.addressesFromNetworkInterface(iface).hasMoreElements()) {
ifaces.add(iface);
}
}
// 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;
}
}
}