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⏎ java/net/InetAddress.java
/*
* Copyright (c) 1995, 2018, 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.util.NavigableSet;
import java.util.ArrayList;
import java.util.Objects;
import java.util.Scanner;
import java.security.AccessController;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.ObjectStreamException;
import java.io.ObjectStreamField;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.ObjectInputStream.GetField;
import java.io.ObjectOutputStream;
import java.io.ObjectOutputStream.PutField;
import java.lang.annotation.Native;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListSet;
import java.util.concurrent.atomic.AtomicLong;
import jdk.internal.misc.JavaNetInetAddressAccess;
import jdk.internal.misc.SharedSecrets;
import sun.security.action.*;
import sun.net.InetAddressCachePolicy;
import sun.net.util.IPAddressUtil;
/**
* This class represents an Internet Protocol (IP) address.
*
* <p> An IP address is either a 32-bit or 128-bit unsigned number
* used by IP, a lower-level protocol on which protocols like UDP and
* TCP are built. The IP address architecture is defined by <a
* href="http://www.ietf.org/rfc/rfc790.txt"><i>RFC 790:
* Assigned Numbers</i></a>, <a
* href="http://www.ietf.org/rfc/rfc1918.txt"> <i>RFC 1918:
* Address Allocation for Private Internets</i></a>, <a
* href="http://www.ietf.org/rfc/rfc2365.txt"><i>RFC 2365:
* Administratively Scoped IP Multicast</i></a>, and <a
* href="http://www.ietf.org/rfc/rfc2373.txt"><i>RFC 2373: IP
* Version 6 Addressing Architecture</i></a>. An instance of an
* InetAddress consists of an IP address and possibly its
* corresponding host name (depending on whether it is constructed
* with a host name or whether it has already done reverse host name
* resolution).
*
* <h3> Address types </h3>
*
* <table class="striped" style="margin-left:2em">
* <caption style="display:none">Description of unicast and multicast address types</caption>
* <thead>
* <tr><th scope="col">Address Type</th><th scope="col">Description</th></tr>
* </thead>
* <tbody>
* <tr><th scope="row" style="vertical-align:top">unicast</th>
* <td>An identifier for a single interface. A packet sent to
* a unicast address is delivered to the interface identified by
* that address.
*
* <p> The Unspecified Address -- Also called anylocal or wildcard
* address. It must never be assigned to any node. It indicates the
* absence of an address. One example of its use is as the target of
* bind, which allows a server to accept a client connection on any
* interface, in case the server host has multiple interfaces.
*
* <p> The <i>unspecified</i> address must not be used as
* the destination address of an IP packet.
*
* <p> The <i>Loopback</i> Addresses -- This is the address
* assigned to the loopback interface. Anything sent to this
* IP address loops around and becomes IP input on the local
* host. This address is often used when testing a
* client.</td></tr>
* <tr><th scope="row" style="vertical-align:top">multicast</th>
* <td>An identifier for a set of interfaces (typically belonging
* to different nodes). A packet sent to a multicast address is
* delivered to all interfaces identified by that address.</td></tr>
* </tbody>
* </table>
*
* <h4> IP address scope </h4>
*
* <p> <i>Link-local</i> addresses are designed to be used for addressing
* on a single link for purposes such as auto-address configuration,
* neighbor discovery, or when no routers are present.
*
* <p> <i>Site-local</i> addresses are designed to be used for addressing
* inside of a site without the need for a global prefix.
*
* <p> <i>Global</i> addresses are unique across the internet.
*
* <h4> Textual representation of IP addresses </h4>
*
* The textual representation of an IP address is address family specific.
*
* <p>
*
* For IPv4 address format, please refer to <A
* HREF="Inet4Address.html#format">Inet4Address#format</A>; For IPv6
* address format, please refer to <A
* HREF="Inet6Address.html#format">Inet6Address#format</A>.
*
* <P>There is a <a href="doc-files/net-properties.html#Ipv4IPv6">couple of
* System Properties</a> affecting how IPv4 and IPv6 addresses are used.</P>
*
* <h4> Host Name Resolution </h4>
*
* Host name-to-IP address <i>resolution</i> is accomplished through
* the use of a combination of local machine configuration information
* and network naming services such as the Domain Name System (DNS)
* and Network Information Service(NIS). The particular naming
* services(s) being used is by default the local machine configured
* one. For any host name, its corresponding IP address is returned.
*
* <p> <i>Reverse name resolution</i> means that for any IP address,
* the host associated with the IP address is returned.
*
* <p> The InetAddress class provides methods to resolve host names to
* their IP addresses and vice versa.
*
* <h4> InetAddress Caching </h4>
*
* The InetAddress class has a cache to store successful as well as
* unsuccessful host name resolutions.
*
* <p> By default, when a security manager is installed, in order to
* protect against DNS spoofing attacks,
* the result of positive host name resolutions are
* cached forever. When a security manager is not installed, the default
* behavior is to cache entries for a finite (implementation dependent)
* period of time. The result of unsuccessful host
* name resolution is cached for a very short period of time (10
* seconds) to improve performance.
*
* <p> If the default behavior is not desired, then a Java security property
* can be set to a different Time-to-live (TTL) value for positive
* caching. Likewise, a system admin can configure a different
* negative caching TTL value when needed.
*
* <p> Two Java security properties control the TTL values used for
* positive and negative host name resolution caching:
*
* <dl style="margin-left:2em">
* <dt><b>networkaddress.cache.ttl</b></dt>
* <dd>Indicates the caching policy for successful name lookups from
* the name service. The value is specified as an integer to indicate
* the number of seconds to cache the successful lookup. The default
* setting is to cache for an implementation specific period of time.
* <p>
* A value of -1 indicates "cache forever".
* </dd>
* <dt><b>networkaddress.cache.negative.ttl</b> (default: 10)</dt>
* <dd>Indicates the caching policy for un-successful name lookups
* from the name service. The value is specified as an integer to
* indicate the number of seconds to cache the failure for
* un-successful lookups.
* <p>
* A value of 0 indicates "never cache".
* A value of -1 indicates "cache forever".
* </dd>
* </dl>
*
* @author Chris Warth
* @see java.net.InetAddress#getByAddress(byte[])
* @see java.net.InetAddress#getByAddress(java.lang.String, byte[])
* @see java.net.InetAddress#getAllByName(java.lang.String)
* @see java.net.InetAddress#getByName(java.lang.String)
* @see java.net.InetAddress#getLocalHost()
* @since 1.0
*/
public
class InetAddress implements java.io.Serializable {
@Native static final int PREFER_IPV4_VALUE = 0;
@Native static final int PREFER_IPV6_VALUE = 1;
@Native static final int PREFER_SYSTEM_VALUE = 2;
/**
* Specify the address family: Internet Protocol, Version 4
* @since 1.4
*/
@Native static final int IPv4 = 1;
/**
* Specify the address family: Internet Protocol, Version 6
* @since 1.4
*/
@Native static final int IPv6 = 2;
/* Specify address family preference */
static transient final int preferIPv6Address;
static class InetAddressHolder {
/**
* Reserve the original application specified hostname.
*
* The original hostname is useful for domain-based endpoint
* identification (see RFC 2818 and RFC 6125). If an address
* was created with a raw IP address, a reverse name lookup
* may introduce endpoint identification security issue via
* DNS forging.
*
* Oracle JSSE provider is using this original hostname, via
* jdk.internal.misc.JavaNetAccess, for SSL/TLS endpoint identification.
*
* Note: May define a new public method in the future if necessary.
*/
String originalHostName;
InetAddressHolder() {}
InetAddressHolder(String hostName, int address, int family) {
this.originalHostName = hostName;
this.hostName = hostName;
this.address = address;
this.family = family;
}
void init(String hostName, int family) {
this.originalHostName = hostName;
this.hostName = hostName;
if (family != -1) {
this.family = family;
}
}
String hostName;
String getHostName() {
return hostName;
}
String getOriginalHostName() {
return originalHostName;
}
/**
* Holds a 32-bit IPv4 address.
*/
int address;
int getAddress() {
return address;
}
/**
* Specifies the address family type, for instance, '1' for IPv4
* addresses, and '2' for IPv6 addresses.
*/
int family;
int getFamily() {
return family;
}
}
/* Used to store the serializable fields of InetAddress */
final transient InetAddressHolder holder;
InetAddressHolder holder() {
return holder;
}
/* Used to store the name service provider */
private static transient NameService nameService = null;
/**
* Used to store the best available hostname.
* Lazily initialized via a data race; safe because Strings are immutable.
*/
private transient String canonicalHostName = null;
/** use serialVersionUID from JDK 1.0.2 for interoperability */
private static final long serialVersionUID = 3286316764910316507L;
/*
* Load net library into runtime, and perform initializations.
*/
static {
String str = java.security.AccessController.doPrivileged(
new GetPropertyAction("java.net.preferIPv6Addresses"));
if (str == null) {
preferIPv6Address = PREFER_IPV4_VALUE;
} else if (str.equalsIgnoreCase("true")) {
preferIPv6Address = PREFER_IPV6_VALUE;
} else if (str.equalsIgnoreCase("false")) {
preferIPv6Address = PREFER_IPV4_VALUE;
} else if (str.equalsIgnoreCase("system")) {
preferIPv6Address = PREFER_SYSTEM_VALUE;
} else {
preferIPv6Address = PREFER_IPV4_VALUE;
}
AccessController.doPrivileged(
new java.security.PrivilegedAction<>() {
public Void run() {
System.loadLibrary("net");
return null;
}
});
SharedSecrets.setJavaNetInetAddressAccess(
new JavaNetInetAddressAccess() {
public String getOriginalHostName(InetAddress ia) {
return ia.holder.getOriginalHostName();
}
public InetAddress getByName(String hostName,
InetAddress hostAddress)
throws UnknownHostException
{
return InetAddress.getByName(hostName, hostAddress);
}
}
);
init();
}
/**
* Constructor for the Socket.accept() method.
* This creates an empty InetAddress, which is filled in by
* the accept() method. This InetAddress, however, is not
* put in the address cache, since it is not created by name.
*/
InetAddress() {
holder = new InetAddressHolder();
}
/**
* Replaces the de-serialized object with an Inet4Address object.
*
* @return the alternate object to the de-serialized object.
*
* @throws ObjectStreamException if a new object replacing this
* object could not be created
*/
private Object readResolve() throws ObjectStreamException {
// will replace the deserialized 'this' object
return new Inet4Address(holder().getHostName(), holder().getAddress());
}
/**
* Utility routine to check if the InetAddress is an
* IP multicast address.
* @return a {@code boolean} indicating if the InetAddress is
* an IP multicast address
* @since 1.1
*/
public boolean isMulticastAddress() {
return false;
}
/**
* Utility routine to check if the InetAddress is a wildcard address.
* @return a {@code boolean} indicating if the Inetaddress is
* a wildcard address.
* @since 1.4
*/
public boolean isAnyLocalAddress() {
return false;
}
/**
* Utility routine to check if the InetAddress is a loopback address.
*
* @return a {@code boolean} indicating if the InetAddress is
* a loopback address; or false otherwise.
* @since 1.4
*/
public boolean isLoopbackAddress() {
return false;
}
/**
* Utility routine to check if the InetAddress is an link local address.
*
* @return a {@code boolean} indicating if the InetAddress is
* a link local address; or false if address is not a link local unicast address.
* @since 1.4
*/
public boolean isLinkLocalAddress() {
return false;
}
/**
* Utility routine to check if the InetAddress is a site local address.
*
* @return a {@code boolean} indicating if the InetAddress is
* a site local address; or false if address is not a site local unicast address.
* @since 1.4
*/
public boolean isSiteLocalAddress() {
return false;
}
/**
* Utility routine to check if the multicast address has global scope.
*
* @return a {@code boolean} indicating if the address has
* is a multicast address of global scope, false if it is not
* of global scope or it is not a multicast address
* @since 1.4
*/
public boolean isMCGlobal() {
return false;
}
/**
* Utility routine to check if the multicast address has node scope.
*
* @return a {@code boolean} indicating if the address has
* is a multicast address of node-local scope, false if it is not
* of node-local scope or it is not a multicast address
* @since 1.4
*/
public boolean isMCNodeLocal() {
return false;
}
/**
* Utility routine to check if the multicast address has link scope.
*
* @return a {@code boolean} indicating if the address has
* is a multicast address of link-local scope, false if it is not
* of link-local scope or it is not a multicast address
* @since 1.4
*/
public boolean isMCLinkLocal() {
return false;
}
/**
* Utility routine to check if the multicast address has site scope.
*
* @return a {@code boolean} indicating if the address has
* is a multicast address of site-local scope, false if it is not
* of site-local scope or it is not a multicast address
* @since 1.4
*/
public boolean isMCSiteLocal() {
return false;
}
/**
* Utility routine to check if the multicast address has organization scope.
*
* @return a {@code boolean} indicating if the address has
* is a multicast address of organization-local scope,
* false if it is not of organization-local scope
* or it is not a multicast address
* @since 1.4
*/
public boolean isMCOrgLocal() {
return false;
}
/**
* Test whether that address is reachable. Best effort is made by the
* implementation to try to reach the host, but firewalls and server
* configuration may block requests resulting in a unreachable status
* while some specific ports may be accessible.
* A typical implementation will use ICMP ECHO REQUESTs if the
* privilege can be obtained, otherwise it will try to establish
* a TCP connection on port 7 (Echo) of the destination host.
* <p>
* The timeout value, in milliseconds, indicates the maximum amount of time
* the try should take. If the operation times out before getting an
* answer, the host is deemed unreachable. A negative value will result
* in an IllegalArgumentException being thrown.
*
* @param timeout the time, in milliseconds, before the call aborts
* @return a {@code boolean} indicating if the address is reachable.
* @throws IOException if a network error occurs
* @throws IllegalArgumentException if {@code timeout} is negative.
* @since 1.5
*/
public boolean isReachable(int timeout) throws IOException {
return isReachable(null, 0 , timeout);
}
/**
* Test whether that address is reachable. Best effort is made by the
* implementation to try to reach the host, but firewalls and server
* configuration may block requests resulting in a unreachable status
* while some specific ports may be accessible.
* A typical implementation will use ICMP ECHO REQUESTs if the
* privilege can be obtained, otherwise it will try to establish
* a TCP connection on port 7 (Echo) of the destination host.
* <p>
* The {@code network interface} and {@code ttl} parameters
* let the caller specify which network interface the test will go through
* and the maximum number of hops the packets should go through.
* A negative value for the {@code ttl} will result in an
* IllegalArgumentException being thrown.
* <p>
* The timeout value, in milliseconds, indicates the maximum amount of time
* the try should take. If the operation times out before getting an
* answer, the host is deemed unreachable. A negative value will result
* in an IllegalArgumentException being thrown.
*
* @param netif the NetworkInterface through which the
* test will be done, or null for any interface
* @param ttl the maximum numbers of hops to try or 0 for the
* default
* @param timeout the time, in milliseconds, before the call aborts
* @throws IllegalArgumentException if either {@code timeout}
* or {@code ttl} are negative.
* @return a {@code boolean}indicating if the address is reachable.
* @throws IOException if a network error occurs
* @since 1.5
*/
public boolean isReachable(NetworkInterface netif, int ttl,
int timeout) throws IOException {
if (ttl < 0)
throw new IllegalArgumentException("ttl can't be negative");
if (timeout < 0)
throw new IllegalArgumentException("timeout can't be negative");
return impl.isReachable(this, timeout, netif, ttl);
}
/**
* Gets the host name for this IP address.
*
* <p>If this InetAddress was created with a host name,
* this host name will be remembered and returned;
* otherwise, a reverse name lookup will be performed
* and the result will be returned based on the system
* configured name lookup service. If a lookup of the name service
* is required, call
* {@link #getCanonicalHostName() getCanonicalHostName}.
*
* <p>If there is a security manager, its
* {@code checkConnect} method is first called
* with the hostname and {@code -1}
* as its arguments to see if the operation is allowed.
* If the operation is not allowed, it will return
* the textual representation of the IP address.
*
* @return the host name for this IP address, or if the operation
* is not allowed by the security check, the textual
* representation of the IP address.
*
* @see InetAddress#getCanonicalHostName
* @see SecurityManager#checkConnect
*/
public String getHostName() {
return getHostName(true);
}
/**
* Returns the hostname for this address.
* If the host is equal to null, then this address refers to any
* of the local machine's available network addresses.
* this is package private so SocketPermission can make calls into
* here without a security check.
*
* <p>If there is a security manager, this method first
* calls its {@code checkConnect} method
* with the hostname and {@code -1}
* as its arguments to see if the calling code is allowed to know
* the hostname for this IP address, i.e., to connect to the host.
* If the operation is not allowed, it will return
* the textual representation of the IP address.
*
* @return the host name for this IP address, or if the operation
* is not allowed by the security check, the textual
* representation of the IP address.
*
* @param check make security check if true
*
* @see SecurityManager#checkConnect
*/
String getHostName(boolean check) {
if (holder().getHostName() == null) {
holder().hostName = InetAddress.getHostFromNameService(this, check);
}
return holder().getHostName();
}
/**
* Gets the fully qualified domain name for this IP address.
* Best effort method, meaning we may not be able to return
* the FQDN depending on the underlying system configuration.
*
* <p>If there is a security manager, this method first
* calls its {@code checkConnect} method
* with the hostname and {@code -1}
* as its arguments to see if the calling code is allowed to know
* the hostname for this IP address, i.e., to connect to the host.
* If the operation is not allowed, it will return
* the textual representation of the IP address.
*
* @return the fully qualified domain name for this IP address,
* or if the operation is not allowed by the security check,
* the textual representation of the IP address.
*
* @see SecurityManager#checkConnect
*
* @since 1.4
*/
public String getCanonicalHostName() {
String value = canonicalHostName;
if (value == null)
canonicalHostName = value =
InetAddress.getHostFromNameService(this, true);
return value;
}
/**
* Returns the hostname for this address.
*
* <p>If there is a security manager, this method first
* calls its {@code checkConnect} method
* with the hostname and {@code -1}
* as its arguments to see if the calling code is allowed to know
* the hostname for this IP address, i.e., to connect to the host.
* If the operation is not allowed, it will return
* the textual representation of the IP address.
*
* @return the host name for this IP address, or if the operation
* is not allowed by the security check, the textual
* representation of the IP address.
*
* @param check make security check if true
*
* @see SecurityManager#checkConnect
*/
private static String getHostFromNameService(InetAddress addr, boolean check) {
String host = null;
try {
// first lookup the hostname
host = nameService.getHostByAddr(addr.getAddress());
/* check to see if calling code is allowed to know
* the hostname for this IP address, ie, connect to the host
*/
if (check) {
SecurityManager sec = System.getSecurityManager();
if (sec != null) {
sec.checkConnect(host, -1);
}
}
/* now get all the IP addresses for this hostname,
* and make sure one of them matches the original IP
* address. We do this to try and prevent spoofing.
*/
InetAddress[] arr = InetAddress.getAllByName0(host, check);
boolean ok = false;
if(arr != null) {
for(int i = 0; !ok && i < arr.length; i++) {
ok = addr.equals(arr[i]);
}
}
//XXX: if it looks a spoof just return the address?
if (!ok) {
host = addr.getHostAddress();
return host;
}
} catch (SecurityException e) {
host = addr.getHostAddress();
} catch (UnknownHostException e) {
host = addr.getHostAddress();
// let next provider resolve the hostname
}
return host;
}
/**
* Returns the raw IP address of this {@code InetAddress}
* object. The result is in network byte order: the highest order
* byte of the address is in {@code getAddress()[0]}.
*
* @return the raw IP address of this object.
*/
public byte[] getAddress() {
return null;
}
/**
* Returns the IP address string in textual presentation.
*
* @return the raw IP address in a string format.
* @since 1.0.2
*/
public String getHostAddress() {
return null;
}
/**
* Returns a hashcode for this IP address.
*
* @return a hash code value for this IP address.
*/
public int hashCode() {
return -1;
}
/**
* Compares this object against the specified object.
* The result is {@code true} if and only if the argument is
* not {@code null} and it represents the same IP address as
* this object.
* <p>
* Two instances of {@code InetAddress} represent the same IP
* address if the length of the byte arrays returned by
* {@code getAddress} is the same for both, and each of the
* array components is the same for the byte arrays.
*
* @param obj the object to compare against.
* @return {@code true} if the objects are the same;
* {@code false} otherwise.
* @see java.net.InetAddress#getAddress()
*/
public boolean equals(Object obj) {
return false;
}
/**
* Converts this IP address to a {@code String}. The
* string returned is of the form: hostname / literal IP
* address.
*
* If the host name is unresolved, no reverse name service lookup
* is performed. The hostname part will be represented by an empty string.
*
* @return a string representation of this IP address.
*/
public String toString() {
String hostName = holder().getHostName();
return Objects.toString(hostName, "")
+ "/" + getHostAddress();
}
// mapping from host name to Addresses - either NameServiceAddresses (while
// still being looked-up by NameService(s)) or CachedAddresses when cached
private static final ConcurrentMap<String, Addresses> cache =
new ConcurrentHashMap<>();
// CachedAddresses that have to expire are kept ordered in this NavigableSet
// which is scanned on each access
private static final NavigableSet<CachedAddresses> expirySet =
new ConcurrentSkipListSet<>();
// common interface
private interface Addresses {
InetAddress[] get() throws UnknownHostException;
}
// a holder for cached addresses with required metadata
private static final class CachedAddresses implements Addresses, Comparable<CachedAddresses> {
private static final AtomicLong seq = new AtomicLong();
final String host;
final InetAddress[] inetAddresses;
final long expiryTime; // time of expiry (in terms of System.nanoTime())
final long id = seq.incrementAndGet(); // each instance is unique
CachedAddresses(String host, InetAddress[] inetAddresses, long expiryTime) {
this.host = host;
this.inetAddresses = inetAddresses;
this.expiryTime = expiryTime;
}
@Override
public InetAddress[] get() throws UnknownHostException {
if (inetAddresses == null) {
throw new UnknownHostException(host);
}
return inetAddresses;
}
@Override
public int compareTo(CachedAddresses other) {
// natural order is expiry time -
// compare difference of expiry times rather than
// expiry times directly, to avoid possible overflow.
// (see System.nanoTime() recommendations...)
long diff = this.expiryTime - other.expiryTime;
if (diff < 0L) return -1;
if (diff > 0L) return 1;
// ties are broken using unique id
return Long.compare(this.id, other.id);
}
}
// a name service lookup based Addresses implementation which replaces itself
// in cache when the result is obtained
private static final class NameServiceAddresses implements Addresses {
private final String host;
private final InetAddress reqAddr;
NameServiceAddresses(String host, InetAddress reqAddr) {
this.host = host;
this.reqAddr = reqAddr;
}
@Override
public InetAddress[] get() throws UnknownHostException {
Addresses addresses;
// only one thread is doing lookup to name service
// for particular host at any time.
synchronized (this) {
// re-check that we are still us + re-install us if slot empty
addresses = cache.putIfAbsent(host, this);
if (addresses == null) {
// this can happen when we were replaced by CachedAddresses in
// some other thread, then CachedAddresses expired and were
// removed from cache while we were waiting for lock...
addresses = this;
}
// still us ?
if (addresses == this) {
// lookup name services
InetAddress[] inetAddresses;
UnknownHostException ex;
int cachePolicy;
try {
inetAddresses = getAddressesFromNameService(host, reqAddr);
ex = null;
cachePolicy = InetAddressCachePolicy.get();
} catch (UnknownHostException uhe) {
inetAddresses = null;
ex = uhe;
cachePolicy = InetAddressCachePolicy.getNegative();
}
// remove or replace us with cached addresses according to cachePolicy
if (cachePolicy == InetAddressCachePolicy.NEVER) {
cache.remove(host, this);
} else {
CachedAddresses cachedAddresses = new CachedAddresses(
host,
inetAddresses,
cachePolicy == InetAddressCachePolicy.FOREVER
? 0L
// cachePolicy is in [s] - we need [ns]
: System.nanoTime() + 1000_000_000L * cachePolicy
);
if (cache.replace(host, this, cachedAddresses) &&
cachePolicy != InetAddressCachePolicy.FOREVER) {
// schedule expiry
expirySet.add(cachedAddresses);
}
}
if (inetAddresses == null) {
throw ex == null ? new UnknownHostException(host) : ex;
}
return inetAddresses;
}
// else addresses != this
}
// delegate to different addresses when we are already replaced
// but outside of synchronized block to avoid any chance of dead-locking
return addresses.get();
}
}
/**
* NameService provides host and address lookup service
*
* @since 9
*/
private interface NameService {
/**
* Lookup a host mapping by name. Retrieve the IP addresses
* associated with a host
*
* @param host the specified hostname
* @return array of IP addresses for the requested host
* @throws UnknownHostException
* if no IP address for the {@code host} could be found
*/
InetAddress[] lookupAllHostAddr(String host)
throws UnknownHostException;
/**
* Lookup the host corresponding to the IP address provided
*
* @param addr byte array representing an IP address
* @return {@code String} representing the host name mapping
* @throws UnknownHostException
* if no host found for the specified IP address
*/
String getHostByAddr(byte[] addr) throws UnknownHostException;
}
/**
* The default NameService implementation, which delegates to the underlying
* OS network libraries to resolve host address mappings.
*
* @since 9
*/
private static final class PlatformNameService implements NameService {
public InetAddress[] lookupAllHostAddr(String host)
throws UnknownHostException
{
return impl.lookupAllHostAddr(host);
}
public String getHostByAddr(byte[] addr)
throws UnknownHostException
{
return impl.getHostByAddr(addr);
}
}
/**
* The HostsFileNameService provides host address mapping
* by reading the entries in a hosts file, which is specified by
* {@code jdk.net.hosts.file} system property
*
* <p>The file format is that which corresponds with the /etc/hosts file
* IP Address host alias list.
*
* <p>When the file lookup is enabled it replaces the default NameService
* implementation
*
* @since 9
*/
private static final class HostsFileNameService implements NameService {
private final String hostsFile;
public HostsFileNameService (String hostsFileName) {
this.hostsFile = hostsFileName;
}
private String addrToString(byte addr[]) {
String stringifiedAddress = null;
if (addr.length == Inet4Address.INADDRSZ) {
stringifiedAddress = Inet4Address.numericToTextFormat(addr);
} else { // treat as an IPV6 jobby
byte[] newAddr
= IPAddressUtil.convertFromIPv4MappedAddress(addr);
if (newAddr != null) {
stringifiedAddress = Inet4Address.numericToTextFormat(addr);
} else {
stringifiedAddress = Inet6Address.numericToTextFormat(addr);
}
}
return stringifiedAddress;
}
/**
* Lookup the host name corresponding to the IP address provided.
* Search the configured host file a host name corresponding to
* the specified IP address.
*
* @param addr byte array representing an IP address
* @return {@code String} representing the host name mapping
* @throws UnknownHostException
* if no host found for the specified IP address
*/
@Override
public String getHostByAddr(byte[] addr) throws UnknownHostException {
String hostEntry;
String host = null;
String addrString = addrToString(addr);
try (Scanner hostsFileScanner = new Scanner(new File(hostsFile), "UTF-8")) {
while (hostsFileScanner.hasNextLine()) {
hostEntry = hostsFileScanner.nextLine();
if (!hostEntry.startsWith("#")) {
hostEntry = removeComments(hostEntry);
if (hostEntry.contains(addrString)) {
host = extractHost(hostEntry, addrString);
if (host != null) {
break;
}
}
}
}
} catch (FileNotFoundException e) {
throw new UnknownHostException("Unable to resolve address "
+ addrString + " as hosts file " + hostsFile
+ " not found ");
}
if ((host == null) || (host.equals("")) || (host.equals(" "))) {
throw new UnknownHostException("Requested address "
+ addrString
+ " resolves to an invalid entry in hosts file "
+ hostsFile);
}
return host;
}
/**
* <p>Lookup a host mapping by name. Retrieve the IP addresses
* associated with a host.
*
* <p>Search the configured hosts file for the addresses assocaited with
* with the specified host name.
*
* @param host the specified hostname
* @return array of IP addresses for the requested host
* @throws UnknownHostException
* if no IP address for the {@code host} could be found
*/
public InetAddress[] lookupAllHostAddr(String host)
throws UnknownHostException {
String hostEntry;
String addrStr = null;
InetAddress[] res = null;
byte addr[] = new byte[4];
ArrayList<InetAddress> inetAddresses = null;
// lookup the file and create a list InetAddress for the specfied host
try (Scanner hostsFileScanner = new Scanner(new File(hostsFile), "UTF-8")) {
while (hostsFileScanner.hasNextLine()) {
hostEntry = hostsFileScanner.nextLine();
if (!hostEntry.startsWith("#")) {
hostEntry = removeComments(hostEntry);
if (hostEntry.contains(host)) {
addrStr = extractHostAddr(hostEntry, host);
if ((addrStr != null) && (!addrStr.equals(""))) {
addr = createAddressByteArray(addrStr);
if (inetAddresses == null) {
inetAddresses = new ArrayList<>(1);
}
if (addr != null) {
inetAddresses.add(InetAddress.getByAddress(host, addr));
}
}
}
}
}
} catch (FileNotFoundException e) {
throw new UnknownHostException("Unable to resolve host " + host
+ " as hosts file " + hostsFile + " not found ");
}
if (inetAddresses != null) {
res = inetAddresses.toArray(new InetAddress[inetAddresses.size()]);
} else {
throw new UnknownHostException("Unable to resolve host " + host
+ " in hosts file " + hostsFile);
}
return res;
}
private String removeComments(String hostsEntry) {
String filteredEntry = hostsEntry;
int hashIndex;
if ((hashIndex = hostsEntry.indexOf("#")) != -1) {
filteredEntry = hostsEntry.substring(0, hashIndex);
}
return filteredEntry;
}
private byte [] createAddressByteArray(String addrStr) {
byte[] addrArray;
// check if IPV4 address - most likely
addrArray = IPAddressUtil.textToNumericFormatV4(addrStr);
if (addrArray == null) {
addrArray = IPAddressUtil.textToNumericFormatV6(addrStr);
}
return addrArray;
}
/** host to ip address mapping */
private String extractHostAddr(String hostEntry, String host) {
String[] mapping = hostEntry.split("\\s+");
String hostAddr = null;
if (mapping.length >= 2) {
// look at the host aliases
for (int i = 1; i < mapping.length; i++) {
if (mapping[i].equalsIgnoreCase(host)) {
hostAddr = mapping[0];
}
}
}
return hostAddr;
}
/**
* IP Address to host mapping
* use first host alias in list
*/
private String extractHost(String hostEntry, String addrString) {
String[] mapping = hostEntry.split("\\s+");
String host = null;
if (mapping.length >= 2) {
if (mapping[0].equalsIgnoreCase(addrString)) {
host = mapping[1];
}
}
return host;
}
}
static final InetAddressImpl impl;
static {
// create the impl
impl = InetAddressImplFactory.create();
// create name service
nameService = createNameService();
}
/**
* Create an instance of the NameService interface based on
* the setting of the {@code jdk.net.hosts.file} system property.
*
* <p>The default NameService is the PlatformNameService, which typically
* delegates name and address resolution calls to the underlying
* OS network libraries.
*
* <p> A HostsFileNameService is created if the {@code jdk.net.hosts.file}
* system property is set. If the specified file doesn't exist, the name or
* address lookup will result in an UnknownHostException. Thus, non existent
* hosts file is handled as if the file is empty.
*
* @return a NameService
*/
private static NameService createNameService() {
String hostsFileName =
GetPropertyAction.privilegedGetProperty("jdk.net.hosts.file");
NameService theNameService;
if (hostsFileName != null) {
theNameService = new HostsFileNameService(hostsFileName);
} else {
theNameService = new PlatformNameService();
}
return theNameService;
}
/**
* Creates an InetAddress based on the provided host name and IP address.
* No name service is checked for the validity of the address.
*
* <p> The host name can either be a machine name, such as
* "{@code java.sun.com}", or a textual representation of its IP
* address.
* <p> No validity checking is done on the host name either.
*
* <p> If addr specifies an IPv4 address an instance of Inet4Address
* will be returned; otherwise, an instance of Inet6Address
* will be returned.
*
* <p> IPv4 address byte array must be 4 bytes long and IPv6 byte array
* must be 16 bytes long
*
* @param host the specified host
* @param addr the raw IP address in network byte order
* @return an InetAddress object created from the raw IP address.
* @exception UnknownHostException if IP address is of illegal length
* @since 1.4
*/
public static InetAddress getByAddress(String host, byte[] addr)
throws UnknownHostException {
if (host != null && host.length() > 0 && host.charAt(0) == '[') {
if (host.charAt(host.length()-1) == ']') {
host = host.substring(1, host.length() -1);
}
}
if (addr != null) {
if (addr.length == Inet4Address.INADDRSZ) {
return new Inet4Address(host, addr);
} else if (addr.length == Inet6Address.INADDRSZ) {
byte[] newAddr
= IPAddressUtil.convertFromIPv4MappedAddress(addr);
if (newAddr != null) {
return new Inet4Address(host, newAddr);
} else {
return new Inet6Address(host, addr);
}
}
}
throw new UnknownHostException("addr is of illegal length");
}
/**
* Determines the IP address of a host, given the host's name.
*
* <p> The host name can either be a machine name, such as
* "{@code java.sun.com}", or a textual representation of its
* IP address. If a literal IP address is supplied, only the
* validity of the address format is checked.
*
* <p> For {@code host} specified in literal IPv6 address,
* either the form defined in RFC 2732 or the literal IPv6 address
* format defined in RFC 2373 is accepted. IPv6 scoped addresses are also
* supported. See <a href="Inet6Address.html#scoped">here</a> for a description of IPv6
* scoped addresses.
*
* <p> If the host is {@code null} or {@code host.length()} is equal
* to zero, then an {@code InetAddress} representing an address of the
* loopback interface is returned.
* See <a href="http://www.ietf.org/rfc/rfc3330.txt">RFC 3330</a>
* section 2 and <a href="http://www.ietf.org/rfc/rfc2373.txt">RFC 2373</a>
* section 2.5.3.
*
* <p> If there is a security manager, and {@code host} is not {@code null}
* or {@code host.length() } is not equal to zero, the security manager's
* {@code checkConnect} method is called with the hostname and {@code -1}
* as its arguments to determine if the operation is allowed.
*
* @param host the specified host, or {@code null}.
* @return an IP address for the given host name.
* @exception UnknownHostException if no IP address for the
* {@code host} could be found, or if a scope_id was specified
* for a global IPv6 address.
* @exception SecurityException if a security manager exists
* and its checkConnect method doesn't allow the operation
*/
public static InetAddress getByName(String host)
throws UnknownHostException {
return InetAddress.getAllByName(host)[0];
}
// called from deployment cache manager
private static InetAddress getByName(String host, InetAddress reqAddr)
throws UnknownHostException {
return InetAddress.getAllByName(host, reqAddr)[0];
}
/**
* Given the name of a host, returns an array of its IP addresses,
* based on the configured name service on the system.
*
* <p> The host name can either be a machine name, such as
* "{@code java.sun.com}", or a textual representation of its IP
* address. If a literal IP address is supplied, only the
* validity of the address format is checked.
*
* <p> For {@code host} specified in <i>literal IPv6 address</i>,
* either the form defined in RFC 2732 or the literal IPv6 address
* format defined in RFC 2373 is accepted. A literal IPv6 address may
* also be qualified by appending a scoped zone identifier or scope_id.
* The syntax and usage of scope_ids is described
* <a href="Inet6Address.html#scoped">here</a>.
*
* <p> If the host is {@code null} or {@code host.length()} is equal
* to zero, then an {@code InetAddress} representing an address of the
* loopback interface is returned.
* See <a href="http://www.ietf.org/rfc/rfc3330.txt">RFC 3330</a>
* section 2 and <a href="http://www.ietf.org/rfc/rfc2373.txt">RFC 2373</a>
* section 2.5.3. </p>
*
* <p> If there is a security manager, and {@code host} is not {@code null}
* or {@code host.length() } is not equal to zero, the security manager's
* {@code checkConnect} method is called with the hostname and {@code -1}
* as its arguments to determine if the operation is allowed.
*
* @param host the name of the host, or {@code null}.
* @return an array of all the IP addresses for a given host name.
*
* @exception UnknownHostException if no IP address for the
* {@code host} could be found, or if a scope_id was specified
* for a global IPv6 address.
* @exception SecurityException if a security manager exists and its
* {@code checkConnect} method doesn't allow the operation.
*
* @see SecurityManager#checkConnect
*/
public static InetAddress[] getAllByName(String host)
throws UnknownHostException {
return getAllByName(host, null);
}
private static InetAddress[] getAllByName(String host, InetAddress reqAddr)
throws UnknownHostException {
if (host == null || host.length() == 0) {
InetAddress[] ret = new InetAddress[1];
ret[0] = impl.loopbackAddress();
return ret;
}
boolean ipv6Expected = false;
if (host.charAt(0) == '[') {
// This is supposed to be an IPv6 literal
if (host.length() > 2 && host.charAt(host.length()-1) == ']') {
host = host.substring(1, host.length() -1);
ipv6Expected = true;
} else {
// This was supposed to be a IPv6 address, but it's not!
throw new UnknownHostException(host + ": invalid IPv6 address");
}
}
// if host is an IP address, we won't do further lookup
if (Character.digit(host.charAt(0), 16) != -1
|| (host.charAt(0) == ':')) {
byte[] addr = null;
int numericZone = -1;
String ifname = null;
// see if it is IPv4 address
addr = IPAddressUtil.textToNumericFormatV4(host);
if (addr == null) {
// This is supposed to be an IPv6 literal
// Check if a numeric or string zone id is present
int pos;
if ((pos=host.indexOf ('%')) != -1) {
numericZone = checkNumericZone (host);
if (numericZone == -1) { /* remainder of string must be an ifname */
ifname = host.substring (pos+1);
}
}
if ((addr = IPAddressUtil.textToNumericFormatV6(host)) == null && host.contains(":")) {
throw new UnknownHostException(host + ": invalid IPv6 address");
}
} else if (ipv6Expected) {
// Means an IPv4 litteral between brackets!
throw new UnknownHostException("["+host+"]");
}
InetAddress[] ret = new InetAddress[1];
if(addr != null) {
if (addr.length == Inet4Address.INADDRSZ) {
ret[0] = new Inet4Address(null, addr);
} else {
if (ifname != null) {
ret[0] = new Inet6Address(null, addr, ifname);
} else {
ret[0] = new Inet6Address(null, addr, numericZone);
}
}
return ret;
}
} else if (ipv6Expected) {
// We were expecting an IPv6 Litteral, but got something else
throw new UnknownHostException("["+host+"]");
}
return getAllByName0(host, reqAddr, true, true);
}
/**
* Returns the loopback address.
* <p>
* The InetAddress returned will represent the IPv4
* loopback address, 127.0.0.1, or the IPv6 loopback
* address, ::1. The IPv4 loopback address returned
* is only one of many in the form 127.*.*.*
*
* @return the InetAddress loopback instance.
* @since 1.7
*/
public static InetAddress getLoopbackAddress() {
return impl.loopbackAddress();
}
/**
* check if the literal address string has %nn appended
* returns -1 if not, or the numeric value otherwise.
*
* %nn may also be a string that represents the displayName of
* a currently available NetworkInterface.
*/
private static int checkNumericZone (String s) throws UnknownHostException {
int percent = s.indexOf ('%');
int slen = s.length();
int digit, zone=0;
if (percent == -1) {
return -1;
}
for (int i=percent+1; i<slen; i++) {
char c = s.charAt(i);
if (c == ']') {
if (i == percent+1) {
/* empty per-cent field */
return -1;
}
break;
}
if ((digit = Character.digit (c, 10)) < 0) {
return -1;
}
zone = (zone * 10) + digit;
}
return zone;
}
private static InetAddress[] getAllByName0 (String host)
throws UnknownHostException
{
return getAllByName0(host, true);
}
/**
* package private so SocketPermission can call it
*/
static InetAddress[] getAllByName0 (String host, boolean check)
throws UnknownHostException {
return getAllByName0 (host, null, check, true);
}
/**
* Designated lookup method.
*
* @param host host name to look up
* @param reqAddr requested address to be the 1st in returned array
* @param check perform security check
* @param useCache use cached value if not expired else always
* perform name service lookup (and cache the result)
* @return array of InetAddress(es)
* @throws UnknownHostException if host name is not found
*/
private static InetAddress[] getAllByName0(String host,
InetAddress reqAddr,
boolean check,
boolean useCache)
throws UnknownHostException {
/* If it gets here it is presumed to be a hostname */
/* make sure the connection to the host is allowed, before we
* give out a hostname
*/
if (check) {
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkConnect(host, -1);
}
}
// remove expired addresses from cache - expirySet keeps them ordered
// by expiry time so we only need to iterate the prefix of the NavigableSet...
long now = System.nanoTime();
for (CachedAddresses caddrs : expirySet) {
// compare difference of time instants rather than
// time instants directly, to avoid possible overflow.
// (see System.nanoTime() recommendations...)
if ((caddrs.expiryTime - now) < 0L) {
// ConcurrentSkipListSet uses weakly consistent iterator,
// so removing while iterating is OK...
if (expirySet.remove(caddrs)) {
// ... remove from cache
cache.remove(caddrs.host, caddrs);
}
} else {
// we encountered 1st element that expires in future
break;
}
}
// look-up or remove from cache
Addresses addrs;
if (useCache) {
addrs = cache.get(host);
} else {
addrs = cache.remove(host);
if (addrs != null) {
if (addrs instanceof CachedAddresses) {
// try removing from expirySet too if CachedAddresses
expirySet.remove(addrs);
}
addrs = null;
}
}
if (addrs == null) {
// create a NameServiceAddresses instance which will look up
// the name service and install it within cache...
Addresses oldAddrs = cache.putIfAbsent(
host,
addrs = new NameServiceAddresses(host, reqAddr)
);
if (oldAddrs != null) { // lost putIfAbsent race
addrs = oldAddrs;
}
}
// ask Addresses to get an array of InetAddress(es) and clone it
return addrs.get().clone();
}
static InetAddress[] getAddressesFromNameService(String host, InetAddress reqAddr)
throws UnknownHostException
{
InetAddress[] addresses = null;
UnknownHostException ex = null;
try {
addresses = nameService.lookupAllHostAddr(host);
} catch (UnknownHostException uhe) {
if (host.equalsIgnoreCase("localhost")) {
addresses = new InetAddress[] { impl.loopbackAddress() };
}
else {
ex = uhe;
}
}
if (addresses == null) {
throw ex == null ? new UnknownHostException(host) : ex;
}
// More to do?
if (reqAddr != null && addresses.length > 1 && !addresses[0].equals(reqAddr)) {
// Find it?
int i = 1;
for (; i < addresses.length; i++) {
if (addresses[i].equals(reqAddr)) {
break;
}
}
// Rotate
if (i < addresses.length) {
InetAddress tmp, tmp2 = reqAddr;
for (int j = 0; j < i; j++) {
tmp = addresses[j];
addresses[j] = tmp2;
tmp2 = tmp;
}
addresses[i] = tmp2;
}
}
return addresses;
}
/**
* Returns an {@code InetAddress} object given the raw IP address .
* The argument is in network byte order: the highest order
* byte of the address is in {@code getAddress()[0]}.
*
* <p> This method doesn't block, i.e. no reverse name service lookup
* is performed.
*
* <p> IPv4 address byte array must be 4 bytes long and IPv6 byte array
* must be 16 bytes long
*
* @param addr the raw IP address in network byte order
* @return an InetAddress object created from the raw IP address.
* @exception UnknownHostException if IP address is of illegal length
* @since 1.4
*/
public static InetAddress getByAddress(byte[] addr)
throws UnknownHostException {
return getByAddress(null, addr);
}
private static final class CachedLocalHost {
final String host;
final InetAddress addr;
final long expiryTime = System.nanoTime() + 5000_000_000L; // now + 5s;
CachedLocalHost(String host, InetAddress addr) {
this.host = host;
this.addr = addr;
}
}
private static volatile CachedLocalHost cachedLocalHost;
/**
* Returns the address of the local host. This is achieved by retrieving
* the name of the host from the system, then resolving that name into
* an {@code InetAddress}.
*
* <P>Note: The resolved address may be cached for a short period of time.
* </P>
*
* <p>If there is a security manager, its
* {@code checkConnect} method is called
* with the local host name and {@code -1}
* as its arguments to see if the operation is allowed.
* If the operation is not allowed, an InetAddress representing
* the loopback address is returned.
*
* @return the address of the local host.
*
* @exception UnknownHostException if the local host name could not
* be resolved into an address.
*
* @see SecurityManager#checkConnect
* @see java.net.InetAddress#getByName(java.lang.String)
*/
public static InetAddress getLocalHost() throws UnknownHostException {
SecurityManager security = System.getSecurityManager();
try {
// is cached data still valid?
CachedLocalHost clh = cachedLocalHost;
if (clh != null && (clh.expiryTime - System.nanoTime()) >= 0L) {
if (security != null) {
security.checkConnect(clh.host, -1);
}
return clh.addr;
}
String local = impl.getLocalHostName();
if (security != null) {
security.checkConnect(local, -1);
}
InetAddress localAddr;
if (local.equals("localhost")) {
// shortcut for "localhost" host name
localAddr = impl.loopbackAddress();
} else {
// call getAllByName0 without security checks and
// without using cached data
try {
localAddr = getAllByName0(local, null, false, false)[0];
} catch (UnknownHostException uhe) {
// Rethrow with a more informative error message.
UnknownHostException uhe2 =
new UnknownHostException(local + ": " +
uhe.getMessage());
uhe2.initCause(uhe);
throw uhe2;
}
}
cachedLocalHost = new CachedLocalHost(local, localAddr);
return localAddr;
} catch (java.lang.SecurityException e) {
return impl.loopbackAddress();
}
}
/**
* Perform class load-time initializations.
*/
private static native void init();
/*
* Returns the InetAddress representing anyLocalAddress
* (typically 0.0.0.0 or ::0)
*/
static InetAddress anyLocalAddress() {
return impl.anyLocalAddress();
}
/*
* Load and instantiate an underlying impl class
*/
static InetAddressImpl loadImpl(String implName) {
Object impl = null;
/*
* Property "impl.prefix" will be prepended to the classname
* of the implementation object we instantiate, to which we
* delegate the real work (like native methods). This
* property can vary across implementations of the java.
* classes. The default is an empty String "".
*/
String prefix = GetPropertyAction.privilegedGetProperty("impl.prefix", "");
try {
@SuppressWarnings("deprecation")
Object tmp = Class.forName("java.net." + prefix + implName).newInstance();
impl = tmp;
} catch (ClassNotFoundException e) {
System.err.println("Class not found: java.net." + prefix +
implName + ":\ncheck impl.prefix property " +
"in your properties file.");
} catch (InstantiationException e) {
System.err.println("Could not instantiate: java.net." + prefix +
implName + ":\ncheck impl.prefix property " +
"in your properties file.");
} catch (IllegalAccessException e) {
System.err.println("Cannot access class: java.net." + prefix +
implName + ":\ncheck impl.prefix property " +
"in your properties file.");
}
if (impl == null) {
try {
@SuppressWarnings("deprecation")
Object tmp = Class.forName(implName).newInstance();
impl = tmp;
} catch (Exception e) {
throw new Error("System property impl.prefix incorrect");
}
}
return (InetAddressImpl) impl;
}
private void readObjectNoData () throws
IOException, ClassNotFoundException {
if (getClass().getClassLoader() != null) {
throw new SecurityException ("invalid address type");
}
}
private static final jdk.internal.misc.Unsafe UNSAFE
= jdk.internal.misc.Unsafe.getUnsafe();
private static final long FIELDS_OFFSET
= UNSAFE.objectFieldOffset(InetAddress.class, "holder");
private void readObject (ObjectInputStream s) throws
IOException, ClassNotFoundException {
if (getClass().getClassLoader() != null) {
throw new SecurityException ("invalid address type");
}
GetField gf = s.readFields();
String host = (String)gf.get("hostName", null);
int address = gf.get("address", 0);
int family = gf.get("family", 0);
if (family != IPv4 && family != IPv6) {
throw new InvalidObjectException("invalid address family type: " + family);
}
InetAddressHolder h = new InetAddressHolder(host, address, family);
UNSAFE.putObject(this, FIELDS_OFFSET, h);
}
/* needed because the serializable fields no longer exist */
/**
* @serialField hostName String
* @serialField address int
* @serialField family int
*/
private static final ObjectStreamField[] serialPersistentFields = {
new ObjectStreamField("hostName", String.class),
new ObjectStreamField("address", int.class),
new ObjectStreamField("family", int.class),
};
private void writeObject (ObjectOutputStream s) throws
IOException {
if (getClass().getClassLoader() != null) {
throw new SecurityException ("invalid address type");
}
PutField pf = s.putFields();
pf.put("hostName", holder().getHostName());
pf.put("address", holder().getAddress());
pf.put("family", holder().getFamily());
s.writeFields();
}
}
/*
* Simple factory to create the impl
*/
class InetAddressImplFactory {
static InetAddressImpl create() {
return InetAddress.loadImpl(isIPv6Supported() ?
"Inet6AddressImpl" : "Inet4AddressImpl");
}
static native boolean isIPv6Supported();
}
⏎ java/net/InetAddress.java
Or download all of them as a single archive file:
File name: java.base-11.0.1-src.zip File size: 8740354 bytes Release date: 2018-11-04 Download
2020-05-29, 204053👍, 0💬
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