| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * Copyright (c) 1995, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.net; |
| |
| import java.io.ObjectStreamException; |
| import java.io.ObjectStreamField; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectInputStream.GetField; |
| import java.io.ObjectOutputStream; |
| import java.io.ObjectOutputStream.PutField; |
| import sun.net.util.IPAddressUtil; |
| import sun.net.spi.nameservice.*; |
| import android.system.GaiException; |
| import android.system.StructAddrinfo; |
| import libcore.io.Libcore; |
| import static android.system.OsConstants.*; |
| |
| /** |
| * 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). |
| * |
| * <h4> Address types </h4> |
| * |
| * <blockquote><table cellspacing=2 summary="Description of unicast and multicast address types"> |
| * <tr><th valign=top><i>unicast</i></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 valign=top><i>multicast</i></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> |
| * </table></blockquote> |
| * |
| * <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: |
| * |
| * <blockquote> |
| * <dl> |
| * <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 as 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> |
| * <p> |
| * <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 as 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> |
| * </blockquote> |
| * |
| * @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 JDK1.0 |
| */ |
| public |
| class InetAddress implements java.io.Serializable { |
| |
| static class InetAddressHolder { |
| |
| InetAddressHolder() {} |
| |
| InetAddressHolder(String hostName, int address, int family) { |
| this.hostName = hostName; |
| this.address = address; |
| this.family = family; |
| } |
| |
| String hostName; |
| |
| String getHostName() { |
| return hostName; |
| } |
| |
| /** |
| * Holds a 32-bit IPv4 address. |
| */ |
| int address; |
| |
| int getAddress() { |
| return address; |
| } |
| |
| /** |
| * Specifies the address family type, for instance, AF_INET for IPv4 |
| * addresses, and AF_INET6 for IPv6 addresses. |
| */ |
| int family; |
| |
| int getFamily() { |
| return family; |
| } |
| } |
| |
| transient InetAddressHolder holder; |
| |
| InetAddressHolder holder() { |
| return holder; |
| } |
| |
| /* The implementation is always dual stack IPv6/IPv4 on android */ |
| static final InetAddressImpl impl = new Inet6AddressImpl(); |
| |
| /* Used to store the name service provider */ |
| private static final NameService nameService = new NameService() { |
| public InetAddress[] lookupAllHostAddr(String host, int netId) |
| throws UnknownHostException { |
| return impl.lookupAllHostAddr(host, netId); |
| } |
| public String getHostByAddr(byte[] addr) |
| throws UnknownHostException { |
| return impl.getHostByAddr(addr); |
| } |
| }; |
| |
| /* Used to store the best available hostname */ |
| private transient String canonicalHostName = null; |
| |
| /** use serialVersionUID from JDK 1.0.2 for interoperability */ |
| private static final long serialVersionUID = 3286316764910316507L; |
| |
| /** |
| * 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</code> indicating if the InetAddress is |
| * an IP multicast address |
| * @since JDK1.1 |
| */ |
| public boolean isMulticastAddress() { |
| return false; |
| } |
| |
| /** |
| * Utility routine to check if the InetAddress in a wildcard address. |
| * @return a <code>boolean</code> 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</code> 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</code> 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</code> 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</code> 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</code> 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</code> 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</code> 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</code> 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</code> indicating if the address is reachable. |
| * @throws IOException if a network error occurs |
| * @throws IllegalArgumentException if <code>timeout</code> 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</code> and <code>ttl</code> 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</code> 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</code> |
| * or <code>ttl</code> are negative. |
| * @return a <code>boolean</code>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</code> method is first called |
| * with the hostname and <code>-1</code> |
| * 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() { |
| if (holder().getHostName() == null) { |
| holder().hostName = InetAddress.getHostFromNameService(this); |
| } |
| 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</code> method |
| * with the hostname and <code>-1</code> |
| * 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() { |
| if (canonicalHostName == null) { |
| canonicalHostName = InetAddress.getHostFromNameService(this); |
| } |
| return canonicalHostName; |
| } |
| |
| /** |
| * Returns the hostname for this address. |
| * |
| * <p>If there is a security manager, this method first |
| * calls its <code>checkConnect</code> method |
| * with the hostname and <code>-1</code> |
| * 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. |
| * |
| * @see SecurityManager#checkConnect |
| */ |
| private static String getHostFromNameService(InetAddress addr) { |
| String host = null; |
| try { |
| // first lookup the hostname |
| host = nameService.getHostByAddr(addr.getAddress()); |
| |
| /* 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 = nameService.lookupAllHostAddr(host, NETID_UNSET); |
| 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 (UnknownHostException e) { |
| host = addr.getHostAddress(); |
| } |
| |
| return host; |
| } |
| |
| /** |
| * Returns the raw IP address of this <code>InetAddress</code> |
| * object. The result is in network byte order: the highest order |
| * byte of the address is in <code>getAddress()[0]</code>. |
| * |
| * @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 JDK1.0.2 |
| */ |
| 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</code> if and only if the argument is |
| * not <code>null</code> and it represents the same IP address as |
| * this object. |
| * <p> |
| * Two instances of <code>InetAddress</code> represent the same IP |
| * address if the length of the byte arrays returned by |
| * <code>getAddress</code> 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</code> if the objects are the same; |
| * <code>false</code> otherwise. |
| * @see java.net.InetAddress#getAddress() |
| */ |
| public boolean equals(Object obj) { |
| return false; |
| } |
| |
| /** |
| * Converts this IP address to a <code>String</code>. 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 ((hostName != null) ? hostName : "") |
| + "/" + getHostAddress(); |
| } |
| |
| /** |
| * 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</code>", 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 { |
| return getByAddress(host, addr, -1 /* scopeId */); |
| } |
| |
| // Do not delete. Called from native code. |
| private static InetAddress getByAddress(String host, byte[] addr, int scopeId) |
| 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, scopeId); |
| } |
| } |
| } |
| 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</code>", 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</code> 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 <tt>null</tt> then an <tt>InetAddress</tt> |
| * 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> |
| * |
| * @param host the specified host, or <code>null</code>. |
| * @return an IP address for the given host name. |
| * @exception UnknownHostException if no IP address for the |
| * <code>host</code> 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 impl.lookupAllHostAddr(host, NETID_UNSET)[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</code>", 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</code> 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 <tt>null</tt> then an <tt>InetAddress</tt> |
| * 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</code> is not |
| * null and <code>host.length() </code> is not equal to zero, the |
| * security manager's |
| * <code>checkConnect</code> method is called |
| * with the hostname and <code>-1</code> |
| * as its arguments to see if the operation is allowed. |
| * |
| * @param host the name of the host, or <code>null</code>. |
| * @return an array of all the IP addresses for a given host name. |
| * |
| * @exception UnknownHostException if no IP address for the |
| * <code>host</code> 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</code> method doesn't allow the operation. |
| * |
| * @see SecurityManager#checkConnect |
| */ |
| public static InetAddress[] getAllByName(String host) |
| throws UnknownHostException { |
| return impl.lookupAllHostAddr(host, NETID_UNSET).clone(); |
| } |
| |
| /** |
| * 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.loopbackAddresses()[0]; |
| } |
| |
| /** |
| * Returns an <code>InetAddress</code> 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]</code>. |
| * |
| * <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); |
| } |
| |
| /** |
| * 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</code>. |
| * |
| * <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</code> method is called |
| * with the local host name and <code>-1</code> |
| * 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 { |
| String local = Libcore.os.uname().nodename; |
| return impl.lookupAllHostAddr(local, NETID_UNSET)[0]; |
| } |
| |
| /* |
| * Returns the InetAddress representing anyLocalAddress |
| * (typically 0.0.0.0 or ::0) |
| */ |
| static InetAddress anyLocalAddress() { |
| return impl.anyLocalAddress(); |
| } |
| |
| private void readObjectNoData (ObjectInputStream s) throws |
| IOException, ClassNotFoundException { |
| // Android-changed : Don't use null to mean the boot classloader. |
| if (getClass().getClassLoader() != BOOT_CLASSLOADER) { |
| throw new SecurityException ("invalid address type"); |
| } |
| } |
| |
| // Android-changed : Don't use null to mean the boot classloader. |
| private static final ClassLoader BOOT_CLASSLOADER = Object.class.getClassLoader(); |
| |
| private void readObject (ObjectInputStream s) throws |
| IOException, ClassNotFoundException { |
| // Android-changed : Don't use null to mean the boot classloader. |
| if (getClass().getClassLoader() != BOOT_CLASSLOADER) { |
| 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); |
| holder = new InetAddressHolder(host, address, family); |
| } |
| |
| /* 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 { |
| // Android-changed : Don't use null to mean the boot classloader. |
| if (getClass().getClassLoader() != BOOT_CLASSLOADER) { |
| throw new SecurityException ("invalid address type"); |
| } |
| PutField pf = s.putFields(); |
| pf.put("hostName", holder().hostName); |
| pf.put("address", holder().address); |
| pf.put("family", holder().family); |
| s.writeFields(); |
| s.flush(); |
| } |
| |
| static final int NETID_UNSET = 0; |
| |
| /** |
| * Returns true if the string is a valid numeric IPv4 or IPv6 address (such as "192.168.0.1"). |
| * This copes with all forms of address that Java supports, detailed in the {@link InetAddress} |
| * class documentation. |
| * |
| * @hide used by frameworks/base to ensure that a getAllByName won't cause a DNS lookup. |
| */ |
| public static boolean isNumeric(String address) { |
| InetAddress inetAddress = parseNumericAddressNoThrow(address); |
| return inetAddress != null && disallowDeprecatedFormats(address, inetAddress) != null; |
| } |
| |
| static InetAddress parseNumericAddressNoThrow(String address) { |
| // Accept IPv6 addresses (only) in square brackets for compatibility. |
| if (address.startsWith("[") && address.endsWith("]") && address.indexOf(':') != -1) { |
| address = address.substring(1, address.length() - 1); |
| } |
| StructAddrinfo hints = new StructAddrinfo(); |
| hints.ai_flags = AI_NUMERICHOST; |
| InetAddress[] addresses = null; |
| try { |
| addresses = Libcore.os.android_getaddrinfo(address, hints, NETID_UNSET); |
| } catch (GaiException ignored) { |
| } |
| return (addresses != null) ? addresses[0] : null; |
| } |
| |
| static InetAddress disallowDeprecatedFormats(String address, InetAddress inetAddress) { |
| // Only IPv4 addresses are problematic. |
| if (!(inetAddress instanceof Inet4Address) || address.indexOf(':') != -1) { |
| return inetAddress; |
| } |
| // If inet_pton(3) can't parse it, it must have been a deprecated format. |
| // We need to return inet_pton(3)'s result to ensure that numbers assumed to be octal |
| // by getaddrinfo(3) are reinterpreted by inet_pton(3) as decimal. |
| return Libcore.os.inet_pton(AF_INET, address); |
| } |
| |
| /** |
| * Returns an InetAddress corresponding to the given numeric address (such |
| * as {@code "192.168.0.1"} or {@code "2001:4860:800d::68"}). |
| * This method will never do a DNS lookup. Non-numeric addresses are errors. |
| * |
| * @hide used by frameworks/base's NetworkUtils.numericToInetAddress |
| * @throws IllegalArgumentException if {@code numericAddress} is not a numeric address |
| */ |
| public static InetAddress parseNumericAddress(String numericAddress) { |
| if (numericAddress == null || numericAddress.isEmpty()) { |
| return Inet6Address.LOOPBACK; |
| } |
| InetAddress result = parseNumericAddressNoThrow(numericAddress); |
| result = disallowDeprecatedFormats(numericAddress, result); |
| if (result == null) { |
| throw new IllegalArgumentException("Not a numeric address: " + numericAddress); |
| } |
| return result; |
| } |
| |
| /** |
| * Removes all entries from the VM's DNS cache. This does not affect the C library's DNS |
| * cache, nor any caching DNS servers between you and the canonical server. |
| * @hide |
| */ |
| public static void clearDnsCache() { |
| impl.clearAddressCache(); |
| } |
| |
| /** |
| * Operates identically to {@code getByName} except host resolution is |
| * performed on the network designated by {@code netId}. |
| * |
| * @param host |
| * the hostName to be resolved to an address or {@code null}. |
| * @param netId the network to use for host resolution. |
| * @return the {@code InetAddress} instance representing the host. |
| * @throws UnknownHostException if the address lookup fails. |
| * @hide internal use only |
| */ |
| public static InetAddress getByNameOnNet(String host, int netId) throws UnknownHostException { |
| return impl.lookupAllHostAddr(host, netId)[0]; |
| } |
| |
| /** |
| * Operates identically to {@code getAllByName} except host resolution is |
| * performed on the network designated by {@code netId}. |
| * |
| * @param host the hostname or literal IP string to be resolved. |
| * @param netId the network to use for host resolution. |
| * @return the array of addresses associated with the specified host. |
| * @throws UnknownHostException if the address lookup fails. |
| * @hide internal use only |
| */ |
| public static InetAddress[] getAllByNameOnNet(String host, int netId) throws UnknownHostException { |
| return impl.lookupAllHostAddr(host, netId).clone(); |
| } |
| |
| // Only called by java.net.SocketPermission. |
| static InetAddress[] getAllByName0(String authHost, boolean check) throws UnknownHostException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| // Only called by java.net.SocketPermission. |
| String getHostName(boolean check) { |
| throw new UnsupportedOperationException(); |
| } |
| } |
