ojluni/src/main/java/java/net/Inet6AddressImpl.java - platform/libcore - Git at Google

 /*
  * Copyright (C) 2014 The Android Open Source Project
  * Copyright (c) 2002, 2005, 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 android.system.ErrnoException;
 import android.system.GaiException;
 import android.system.StructAddrinfo;
 import dalvik.system.BlockGuard;
 import libcore.io.Libcore;

 import java.io.IOException;

 import static android.system.OsConstants.AF_UNSPEC;
 import static android.system.OsConstants.AI_ADDRCONFIG;
 import static android.system.OsConstants.EACCES;
 import static android.system.OsConstants.SOCK_STREAM;

 /*
  * Package private implementation of InetAddressImpl for dual
  * IPv4/IPv6 stack. {@code #anyLocalAddress()} will always return an IPv6 address.
  *
  * @since 1.4
  */

 class Inet6AddressImpl implements InetAddressImpl {

     // @GuardedBy(Inet6AddressImpl.class)
     private static InetAddress anyLocalAddress;
     // @GuardedBy(Inet6AddressImpl.class)
     private static InetAddress[] loopbackAddresses;

     private static final AddressCache addressCache = new AddressCache();

     @Override
     public InetAddress[] lookupAllHostAddr(String host, int netId) throws UnknownHostException {
         if (host == null || host.isEmpty()) {
             // Android-changed : Return both the Inet4 and Inet6 loopback addresses
             // when host == null or empty.
             return loopbackAddresses();
         }

         // Is it a numeric address?
         InetAddress result = InetAddress.parseNumericAddressNoThrow(host);
         if (result != null) {
             result = InetAddress.disallowDeprecatedFormats(host, result);
             if (result == null) {
                 throw new UnknownHostException("Deprecated IPv4 address format: " + host);
             }
             return new InetAddress[] { result };
         }

         return lookupHostByName(host, netId);
     }

     /**
      * Resolves a hostname to its IP addresses using a cache.
      *
      * @param host the hostname to resolve.
      * @param netId the network to perform resolution upon.
      * @return the IP addresses of the host.
      */
     private static InetAddress[] lookupHostByName(String host, int netId)
             throws UnknownHostException {
         BlockGuard.getThreadPolicy().onNetwork();
         // Do we have a result cached?
         Object cachedResult = addressCache.get(host, netId);
         if (cachedResult != null) {
             if (cachedResult instanceof InetAddress[]) {
                 // A cached positive result.
                 return (InetAddress[]) cachedResult;
             } else {
                 // A cached negative result.
                 throw new UnknownHostException((String) cachedResult);
             }
         }
         try {
             StructAddrinfo hints = new StructAddrinfo();
             hints.ai_flags = AI_ADDRCONFIG;
             hints.ai_family = AF_UNSPEC;
             // If we don't specify a socket type, every address will appear twice, once
             // for SOCK_STREAM and one for SOCK_DGRAM. Since we do not return the family
             // anyway, just pick one.
             hints.ai_socktype = SOCK_STREAM;
             InetAddress[] addresses = Libcore.os.android_getaddrinfo(host, hints, netId);
             // TODO: should getaddrinfo set the hostname of the InetAddresses it returns?
             for (InetAddress address : addresses) {
                 address.holder().hostName = host;
             }
             addressCache.put(host, netId, addresses);
             return addresses;
         } catch (GaiException gaiException) {
             // If the failure appears to have been a lack of INTERNET permission, throw a clear
             // SecurityException to aid in debugging this common mistake.
             // http://code.google.com/p/android/issues/detail?id=15722
             if (gaiException.getCause() instanceof ErrnoException) {
                 if (((ErrnoException) gaiException.getCause()).errno == EACCES) {
                     throw new SecurityException("Permission denied (missing INTERNET permission?)", gaiException);
                 }
             }
             // Otherwise, throw an UnknownHostException.
             String detailMessage = "Unable to resolve host \"" + host + "\": " + Libcore.os.gai_strerror(gaiException.error);
             addressCache.putUnknownHost(host, netId, detailMessage);
             throw gaiException.rethrowAsUnknownHostException(detailMessage);
         }
     }

     @Override
     public String getHostByAddr(byte[] addr) throws UnknownHostException {
         BlockGuard.getThreadPolicy().onNetwork();

         return getHostByAddr0(addr);
     }

     @Override
     public void clearAddressCache() {
         addressCache.clear();
     }

     @Override
     public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException {
         byte[] ifaddr = null;
         int scope = -1;
         int netif_scope = -1;
         if (netif != null) {
             /*
              * Let's make sure we bind to an address of the proper family.
              * Which means same family as addr because at this point it could
              * be either an IPv6 address or an IPv4 address (case of a dual
              * stack system).
              */
             java.util.Enumeration it = netif.getInetAddresses();
             InetAddress inetaddr = null;
             while (it.hasMoreElements()) {
                 inetaddr = (InetAddress) it.nextElement();
                 if (inetaddr.getClass().isInstance(addr)) {
                     ifaddr = inetaddr.getAddress();
                     if (inetaddr instanceof Inet6Address) {
                         netif_scope = ((Inet6Address) inetaddr).getScopeId();
                     }
                     break;
                 }
             }
             if (ifaddr == null) {
                 // Interface doesn't support the address family of
                 // the destination
                 return false;
             }
         }
         if (addr instanceof Inet6Address)
             scope = ((Inet6Address) addr).getScopeId();

         BlockGuard.getThreadPolicy().onNetwork();

         // Never throw an IOException from isReachable. If something terrible happens either
         // with the network interface in question (or with the destination), then just return
         // false (i.e, state that the address is unreachable.
         try {
             return isReachable0(addr.getAddress(), scope, timeout, ifaddr, ttl, netif_scope);
         } catch (IOException ioe) {
             return false;
         }
     }

     @Override
     public InetAddress anyLocalAddress() {
         synchronized (Inet6AddressImpl.class) {
             // We avoid initializing anyLocalAddress during <clinit> to avoid issues
             // caused by the dependency chains of these classes. InetAddress depends on
             // InetAddressImpl, but Inet6Address & Inet4Address are its subclasses.
             // Also see {@code loopbackAddresses).
             if (anyLocalAddress == null) {
                 Inet6Address anyAddress = new Inet6Address();
                 anyAddress.holder().hostName = "::";
                 anyLocalAddress = anyAddress;
             }

             return anyLocalAddress;
         }
     }

     @Override
     public InetAddress[] loopbackAddresses() {
         synchronized (Inet6AddressImpl.class) {
             // We avoid initializing anyLocalAddress during <clinit> to avoid issues
             // caused by the dependency chains of these classes. InetAddress depends on
             // InetAddressImpl, but Inet6Address & Inet4Address are its subclasses.
             // Also see {@code anyLocalAddress).
             if (loopbackAddresses == null) {
                 loopbackAddresses = new InetAddress[]{Inet6Address.LOOPBACK, Inet4Address.LOOPBACK};
             }

             return loopbackAddresses;
         }
     }

     private native String getHostByAddr0(byte[] addr) throws UnknownHostException;
     private native boolean isReachable0(byte[] addr, int scope, int timeout, byte[] inf, int ttl, int if_scope) throws IOException;
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	* Copyright (c) 2002, 2005, 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 android.system.ErrnoException;
	import android.system.GaiException;
	import android.system.StructAddrinfo;
	import dalvik.system.BlockGuard;
	import libcore.io.Libcore;

	import java.io.IOException;

	import static android.system.OsConstants.AF_UNSPEC;
	import static android.system.OsConstants.AI_ADDRCONFIG;
	import static android.system.OsConstants.EACCES;
	import static android.system.OsConstants.SOCK_STREAM;

	/*
	* Package private implementation of InetAddressImpl for dual
	* IPv4/IPv6 stack. {@code #anyLocalAddress()} will always return an IPv6 address.
	*
	* @since 1.4
	*/

	class Inet6AddressImpl implements InetAddressImpl {

	// @GuardedBy(Inet6AddressImpl.class)
	private static InetAddress anyLocalAddress;
	// @GuardedBy(Inet6AddressImpl.class)
	private static InetAddress[] loopbackAddresses;

	private static final AddressCache addressCache = new AddressCache();

	@Override
	public InetAddress[] lookupAllHostAddr(String host, int netId) throws UnknownHostException {
	if (host == null \|\| host.isEmpty()) {
	// Android-changed : Return both the Inet4 and Inet6 loopback addresses
	// when host == null or empty.
	return loopbackAddresses();
	}

	// Is it a numeric address?
	InetAddress result = InetAddress.parseNumericAddressNoThrow(host);
	if (result != null) {
	result = InetAddress.disallowDeprecatedFormats(host, result);
	if (result == null) {
	throw new UnknownHostException("Deprecated IPv4 address format: " + host);
	}
	return new InetAddress[] { result };
	}

	return lookupHostByName(host, netId);
	}

	/**
	* Resolves a hostname to its IP addresses using a cache.
	*
	* @param host the hostname to resolve.
	* @param netId the network to perform resolution upon.
	* @return the IP addresses of the host.
	*/
	private static InetAddress[] lookupHostByName(String host, int netId)
	throws UnknownHostException {
	BlockGuard.getThreadPolicy().onNetwork();
	// Do we have a result cached?
	Object cachedResult = addressCache.get(host, netId);
	if (cachedResult != null) {
	if (cachedResult instanceof InetAddress[]) {
	// A cached positive result.
	return (InetAddress[]) cachedResult;
	} else {
	// A cached negative result.
	throw new UnknownHostException((String) cachedResult);
	}
	}
	try {
	StructAddrinfo hints = new StructAddrinfo();
	hints.ai_flags = AI_ADDRCONFIG;
	hints.ai_family = AF_UNSPEC;
	// If we don't specify a socket type, every address will appear twice, once
	// for SOCK_STREAM and one for SOCK_DGRAM. Since we do not return the family
	// anyway, just pick one.
	hints.ai_socktype = SOCK_STREAM;
	InetAddress[] addresses = Libcore.os.android_getaddrinfo(host, hints, netId);
	// TODO: should getaddrinfo set the hostname of the InetAddresses it returns?
	for (InetAddress address : addresses) {
	address.holder().hostName = host;
	}
	addressCache.put(host, netId, addresses);
	return addresses;
	} catch (GaiException gaiException) {
	// If the failure appears to have been a lack of INTERNET permission, throw a clear
	// SecurityException to aid in debugging this common mistake.
	// http://code.google.com/p/android/issues/detail?id=15722
	if (gaiException.getCause() instanceof ErrnoException) {
	if (((ErrnoException) gaiException.getCause()).errno == EACCES) {
	throw new SecurityException("Permission denied (missing INTERNET permission?)", gaiException);
	}
	}
	// Otherwise, throw an UnknownHostException.
	String detailMessage = "Unable to resolve host \"" + host + "\": " + Libcore.os.gai_strerror(gaiException.error);
	addressCache.putUnknownHost(host, netId, detailMessage);
	throw gaiException.rethrowAsUnknownHostException(detailMessage);
	}
	}

	@Override
	public String getHostByAddr(byte[] addr) throws UnknownHostException {
	BlockGuard.getThreadPolicy().onNetwork();

	return getHostByAddr0(addr);
	}

	@Override
	public void clearAddressCache() {
	addressCache.clear();
	}

	@Override
	public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException {
	byte[] ifaddr = null;
	int scope = -1;
	int netif_scope = -1;
	if (netif != null) {
	/*
	* Let's make sure we bind to an address of the proper family.
	* Which means same family as addr because at this point it could
	* be either an IPv6 address or an IPv4 address (case of a dual
	* stack system).
	*/
	java.util.Enumeration it = netif.getInetAddresses();
	InetAddress inetaddr = null;
	while (it.hasMoreElements()) {
	inetaddr = (InetAddress) it.nextElement();
	if (inetaddr.getClass().isInstance(addr)) {
	ifaddr = inetaddr.getAddress();
	if (inetaddr instanceof Inet6Address) {
	netif_scope = ((Inet6Address) inetaddr).getScopeId();
	}
	break;
	}
	}
	if (ifaddr == null) {
	// Interface doesn't support the address family of
	// the destination
	return false;
	}
	}
	if (addr instanceof Inet6Address)
	scope = ((Inet6Address) addr).getScopeId();

	BlockGuard.getThreadPolicy().onNetwork();

	// Never throw an IOException from isReachable. If something terrible happens either
	// with the network interface in question (or with the destination), then just return
	// false (i.e, state that the address is unreachable.
	try {
	return isReachable0(addr.getAddress(), scope, timeout, ifaddr, ttl, netif_scope);
	} catch (IOException ioe) {
	return false;
	}
	}

	@Override
	public InetAddress anyLocalAddress() {
	synchronized (Inet6AddressImpl.class) {
	// We avoid initializing anyLocalAddress during <clinit> to avoid issues
	// caused by the dependency chains of these classes. InetAddress depends on
	// InetAddressImpl, but Inet6Address & Inet4Address are its subclasses.
	// Also see {@code loopbackAddresses).
	if (anyLocalAddress == null) {
	Inet6Address anyAddress = new Inet6Address();
	anyAddress.holder().hostName = "::";
	anyLocalAddress = anyAddress;
	}

	return anyLocalAddress;
	}
	}

	@Override
	public InetAddress[] loopbackAddresses() {
	synchronized (Inet6AddressImpl.class) {
	// We avoid initializing anyLocalAddress during <clinit> to avoid issues
	// caused by the dependency chains of these classes. InetAddress depends on
	// InetAddressImpl, but Inet6Address & Inet4Address are its subclasses.
	// Also see {@code anyLocalAddress).
	if (loopbackAddresses == null) {
	loopbackAddresses = new InetAddress[]{Inet6Address.LOOPBACK, Inet4Address.LOOPBACK};
	}

	return loopbackAddresses;
	}
	}

	private native String getHostByAddr0(byte[] addr) throws UnknownHostException;
	private native boolean isReachable0(byte[] addr, int scope, int timeout, byte[] inf, int ttl, int if_scope) throws IOException;
	}