/*
* Copyright 2009-2016 Weibo, Inc.
*
* Licensed 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 com.networknt.utility;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.*;
import java.util.Enumeration;
import java.util.Map;
import java.util.regex.Pattern;
/**
* @author fishermen
* @version V1.0 created at: 2013-5-28
*/
public class NetUtils {
private static final Logger logger = LoggerFactory.getLogger(NetUtils.class);
public static final String LOCALHOST = "127.0.0.1";
public static final String ANYHOST = "0.0.0.0";
private static volatile InetAddress LOCAL_ADDRESS = null;
private static final Pattern LOCAL_IP_PATTERN = Pattern.compile("127(\\.\\d{1,3}){3}$");
private static final Pattern ADDRESS_PATTERN = Pattern.compile("^\\d{1,3}(\\.\\d{1,3}){3}\\:\\d{1,5}$");
private static final Pattern IP_PATTERN = Pattern.compile("\\d{1,3}(\\.\\d{1,3}){3,5}$");
public static boolean isInvalidLocalHost(String host) {
return host == null || host.length() == 0 || host.equalsIgnoreCase("localhost") || host.equals("0.0.0.0")
|| (LOCAL_IP_PATTERN.matcher(host).matches());
}
public static boolean isValidLocalHost(String host) {
return !isInvalidLocalHost(host);
}
/**
* {@link #getLocalAddress(Map)}
*
* @return InetAddress InetAddress
*/
public static InetAddress getLocalAddress() {
return getLocalAddress(null);
}
/**
* <pre>
* 1. check if you already have ip
* 2. get ip from hostname
* 3. get ip from socket
* 4. get ip from network interface
* </pre>
* @param destHostPorts a map of ports
* @return local ip
*/
public static InetAddress getLocalAddress(Map<String, Integer> destHostPorts) {
if (LOCAL_ADDRESS != null) {
return LOCAL_ADDRESS;
}
InetAddress localAddress = getLocalAddressByHostname();
if (!isValidAddress(localAddress)) {
localAddress = getLocalAddressBySocket(destHostPorts);
}
if (!isValidAddress(localAddress)) {
localAddress = getLocalAddressByNetworkInterface();
}
if (isValidAddress(localAddress)) {
LOCAL_ADDRESS = localAddress;
}
return localAddress;
}
private static InetAddress getLocalAddressByHostname() {
try {
InetAddress localAddress = InetAddress.getLocalHost();
if (isValidAddress(localAddress)) {
return localAddress;
}
} catch (Throwable e) {
logger.error("Failed to retriving local address by hostname:" + e);
}
return null;
}
private static InetAddress getLocalAddressBySocket(Map<String, Integer> destHostPorts) {
if (destHostPorts == null || destHostPorts.size() == 0) {
return null;
}
for (Map.Entry<String, Integer> entry : destHostPorts.entrySet()) {
String host = entry.getKey();
int port = entry.getValue();
try {
Socket socket = new Socket();
try {
SocketAddress addr = new InetSocketAddress(host, port);
socket.connect(addr, 1000);
return socket.getLocalAddress();
} finally {
try {
socket.close();
} catch (Throwable e) {}
}
} catch (Exception e) {
logger.error(String.format("Failed to retriving local address by connecting to dest host:port(%s:%s) false, e=%s", host,
port, e));
}
}
return null;
}
private static InetAddress getLocalAddressByNetworkInterface() {
try {
Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
if (interfaces != null) {
while (interfaces.hasMoreElements()) {
try {
NetworkInterface network = interfaces.nextElement();
Enumeration<InetAddress> addresses = network.getInetAddresses();
while (addresses.hasMoreElements()) {
try {
InetAddress address = addresses.nextElement();
if (isValidAddress(address)) {
return address;
}
} catch (Throwable e) {
logger.error("Failed to retriving ip address, " + e.getMessage(), e);
}
}
} catch (Throwable e) {
logger.error("Failed to retriving ip address, " + e.getMessage(), e);
}
}
}
} catch (Throwable e) {
logger.error("Failed to retriving ip address, " + e.getMessage(), e);
}
return null;
}
public static boolean isValidAddress(String address) {
return ADDRESS_PATTERN.matcher(address).matches();
}
public static boolean isValidAddress(InetAddress address) {
if (address == null || address.isLoopbackAddress()) return false;
String name = address.getHostAddress();
return (name != null && !ANYHOST.equals(name) && !LOCALHOST.equals(name) && IP_PATTERN.matcher(name).matches());
}
//return ip to avoid lookup dns
public static String getHostName(SocketAddress socketAddress) {
if (socketAddress == null) {
return null;
}
if (socketAddress instanceof InetSocketAddress) {
InetAddress addr = ((InetSocketAddress) socketAddress).getAddress();
if(addr != null){
return addr.getHostAddress();
}
}
return null;
}
}