| /* |
| * 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<InetAddress> it = netif.getInetAddresses(); |
| InetAddress inetaddr = null; |
| while (it.hasMoreElements()) { |
| inetaddr = 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; |
| } |