| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * Copyright (c) 2002, 2013, 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 android.system.StructIcmpHdr; |
| |
| import dalvik.system.BlockGuard; |
| |
| import libcore.io.IoBridge; |
| import libcore.io.Libcore; |
| |
| import java.io.FileDescriptor; |
| import java.io.IOException; |
| |
| import static android.system.OsConstants.AF_INET; |
| import static android.system.OsConstants.AF_INET6; |
| 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.ECONNREFUSED; |
| import static android.system.OsConstants.NI_NAMEREQD; |
| import static android.system.OsConstants.ICMP6_ECHO_REPLY; |
| import static android.system.OsConstants.ICMP_ECHOREPLY; |
| import static android.system.OsConstants.IPPROTO_ICMP; |
| import static android.system.OsConstants.IPPROTO_ICMPV6; |
| import static android.system.OsConstants.SOCK_DGRAM; |
| import static android.system.OsConstants.SOCK_STREAM; |
| |
| // Android-note: Android-specific behavior and Linux-based implementation |
| // http://b/36933260 Implement root-less ICMP for isReachable() |
| // http://b/28609551 Rewrite getHostByAddr0 using POSIX library Libcore.os. |
| // http://b/25861497 Add BlockGuard checks. |
| // http://b/26700324 Fix odd dependency chains of the static InetAddress. |
| // anyLocalAddress() Let anyLocalAddress() always return an IPv6 address. |
| // Let loopbackAddresses() return both Inet4 and Inet6 loopbacks. |
| // Rewrote hostname lookup methods on top of Libcore.os. Merge implementation from InetAddress |
| // and remove native methods in this class |
| /* |
| * 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(); |
| |
| // BEGIN Android-changed: Rewrote hostname lookup methods on top of Libcore.os. |
| /* |
| public native String getLocalHostName() throws UnknownHostException; |
| public native InetAddress[] |
| lookupAllHostAddr(String hostname) throws UnknownHostException; |
| public native String getHostByAddr(byte[] addr) throws UnknownHostException; |
| private native boolean isReachable0(byte[] addr, int scope, int timeout, byte[] inf, int ttl, int if_scope) throws IOException; |
| */ |
| @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; |
| address.holder().originalHostName = 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(); |
| } |
| // END Android-changed: Rewrote hostname lookup methods on top of Libcore.os. |
| |
| @Override |
| public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException { |
| // Android-changed: rewritten on the top of IoBridge and Libcore.os. |
| InetAddress sourceAddr = null; |
| 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)) { |
| sourceAddr = inetaddr; |
| break; |
| } |
| } |
| |
| if (sourceAddr == null) { |
| // Interface doesn't support the address family of |
| // the destination |
| return false; |
| } |
| } |
| |
| // Android-changed: http://b/36933260 Implement root-less ICMP for isReachable(). |
| /* |
| if (addr instanceof Inet6Address) |
| scope = ((Inet6Address) addr).getScopeId(); |
| return isReachable0(addr.getAddress(), scope, timeout, ifaddr, ttl, netif_scope); |
| */ |
| // Try ICMP first |
| if (icmpEcho(addr, timeout, sourceAddr, ttl)) { |
| return true; |
| } |
| |
| // No good, let's fall back to TCP |
| return tcpEcho(addr, timeout, sourceAddr, ttl); |
| } |
| |
| // BEGIN Android-added: http://b/36933260 Implement root-less ICMP for isReachable(). |
| private boolean tcpEcho(InetAddress addr, int timeout, InetAddress sourceAddr, int ttl) |
| throws IOException { |
| FileDescriptor fd = null; |
| try { |
| fd = IoBridge.socket(AF_INET6, SOCK_STREAM, 0); |
| if (ttl > 0) { |
| IoBridge.setSocketOption(fd, IoBridge.JAVA_IP_TTL, ttl); |
| } |
| if (sourceAddr != null) { |
| IoBridge.bind(fd, sourceAddr, 0); |
| } |
| IoBridge.connect(fd, addr, 7 /* Echo-protocol port */, timeout); |
| return true; |
| } catch (IOException e) { |
| // Connection refused by remote (ECONNREFUSED) implies reachable. Otherwise silently |
| // ignore the exception and return false. |
| Throwable cause = e.getCause(); |
| return cause instanceof ErrnoException |
| && ((ErrnoException) cause).errno == ECONNREFUSED; |
| } finally { |
| IoBridge.closeAndSignalBlockedThreads(fd); |
| } |
| } |
| |
| protected boolean icmpEcho(InetAddress addr, int timeout, InetAddress sourceAddr, int ttl) |
| throws IOException { |
| |
| FileDescriptor fd = null; |
| try { |
| boolean isIPv4 = addr instanceof Inet4Address; |
| int domain = isIPv4 ? AF_INET : AF_INET6; |
| int icmpProto = isIPv4 ? IPPROTO_ICMP : IPPROTO_ICMPV6; |
| fd = IoBridge.socket(domain, SOCK_DGRAM, icmpProto); |
| |
| if (ttl > 0) { |
| IoBridge.setSocketOption(fd, IoBridge.JAVA_IP_TTL, ttl); |
| } |
| if (sourceAddr != null) { |
| IoBridge.bind(fd, sourceAddr, 0); |
| } |
| |
| byte[] packet; |
| |
| // ICMP is unreliable, try sending requests every second until timeout. |
| for (int to = timeout, seq = 0; to > 0; ++seq) { |
| int sockTo = to >= 1000 ? 1000 : to; |
| |
| IoBridge.setSocketOption(fd, SocketOptions.SO_TIMEOUT, sockTo); |
| |
| packet = StructIcmpHdr.IcmpEchoHdr(isIPv4, seq).getBytes(); |
| IoBridge.sendto(fd, packet, 0, packet.length, 0, addr, 0); |
| final int icmpId = IoBridge.getLocalInetSocketAddress(fd).getPort(); |
| |
| byte[] received = new byte[packet.length]; |
| DatagramPacket receivedPacket = new DatagramPacket(received, packet.length); |
| int size = IoBridge |
| .recvfrom(true, fd, received, 0, received.length, 0, receivedPacket, false); |
| if (size == packet.length) { |
| byte expectedType = isIPv4 ? (byte) ICMP_ECHOREPLY |
| : (byte) ICMP6_ECHO_REPLY; |
| if (receivedPacket.getAddress().equals(addr) |
| && received[0] == expectedType |
| && received[4] == (byte) (icmpId >> 8) |
| && received[5] == (byte) icmpId |
| && received[6] == (byte) (seq >> 8) |
| && received[7] == (byte) seq) { |
| // This is the packet we're expecting. |
| return true; |
| } |
| } |
| to -= sockTo; |
| } |
| } catch (IOException e) { |
| // Silently ignore and fall back. |
| } finally { |
| if (fd != null) { |
| try { |
| Libcore.os.close(fd); |
| } catch (ErrnoException e) { } |
| } |
| } |
| |
| return false; |
| } |
| // END Android-added: http://b/36933260 Implement root-less ICMP for isReachable(). |
| |
| // BEGIN Android-changed: Let anyLocalAddress() always return an IPv6 address. |
| @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). http://b/26700324 |
| if (anyLocalAddress == null) { |
| Inet6Address anyAddress = new Inet6Address(); |
| anyAddress.holder().hostName = "::"; |
| anyLocalAddress = anyAddress; |
| } |
| |
| return anyLocalAddress; |
| } |
| } |
| // END Android-changed: Let anyLocalAddress() always return an IPv6 address. |
| |
| // BEGIN Android-changed: Let loopbackAddresses() return both Inet4 and Inet6 loopbacks. |
| @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; |
| } |
| } |
| // END Android-changed: Let loopbackAddresses() return both Inet4 and Inet6 loopbacks. |
| |
| // BEGIN Android-changed: b/28609551 Rewrite getHostByAddr0 using POSIX library Libcore.os. |
| private String getHostByAddr0(byte[] addr) throws UnknownHostException { |
| // Android-changed: Rewritten on the top of Libcore.os |
| InetAddress hostaddr = InetAddress.getByAddress(addr); |
| try { |
| return Libcore.os.getnameinfo(hostaddr, NI_NAMEREQD); |
| } catch (GaiException e) { |
| UnknownHostException uhe = new UnknownHostException(hostaddr.toString()); |
| uhe.initCause(e); |
| throw uhe; |
| } |
| } |
| // END Android-changed: b/28609551 Rewrite getHostByAddr0 using POSIX library Libcore.os. |
| } |