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Inet4AddressImpl.java
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74 lines (70 loc) · 2.05 KB
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/*
* Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.net;
import java.io.IOException;
/*
* Package private implementation of InetAddressImpl for IPv4.
*
* @since 1.4
*/
class Inet4AddressImpl implements InetAddressImpl {
public native String getLocalHostName() throws UnknownHostException;
public native InetAddress[]
lookupAllHostAddr(String hostname) throws UnknownHostException;
public native String getHostByAddr(byte[] addr) throws UnknownHostException;
private native boolean isReachable0(byte[] addr, int timeout, byte[] ifaddr, int ttl) throws IOException;
public synchronized InetAddress anyLocalAddress() {
if (anyLocalAddress == null) {
anyLocalAddress = new Inet4Address(); // {0x00,0x00,0x00,0x00}
anyLocalAddress.holder().hostName = "0.0.0.0";
}
return anyLocalAddress;
}
public synchronized InetAddress loopbackAddress() {
if (loopbackAddress == null) {
byte[] loopback = {0x7f,0x00,0x00,0x01};
loopbackAddress = new Inet4Address("localhost", loopback);
}
return loopbackAddress;
}
public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException {
byte[] ifaddr = null;
if (netif != null) {
/*
* Let's make sure we use an address of the proper family
*/
java.util.Enumeration<InetAddress> it = netif.getInetAddresses();
InetAddress inetaddr = null;
while (!(inetaddr instanceof Inet4Address) &&
it.hasMoreElements())
inetaddr = it.nextElement();
if (inetaddr instanceof Inet4Address)
ifaddr = inetaddr.getAddress();
}
return isReachable0(addr.getAddress(), timeout, ifaddr, ttl);
}
private InetAddress anyLocalAddress;
private InetAddress loopbackAddress;
}