| | |
| | | |
| | | import java.io.*; |
| | | import java.lang.reflect.InvocationTargetException; |
| | | import java.net.*; |
| | | import java.net.InetAddress; |
| | | import java.net.InetSocketAddress; |
| | | import java.net.ServerSocket; |
| | | import java.net.Socket; |
| | | import java.nio.ByteBuffer; |
| | | import java.nio.channels.SelectionKey; |
| | | import java.nio.channels.Selector; |
| | |
| | | } |
| | | |
| | | |
| | | |
| | | /** |
| | | * Returns {@code true} if the provided IPv4 or IPv6 address or host name |
| | | * represents the address of one of the interfaces on the current host |
| | | * machine. |
| | | * |
| | | * @param addressString |
| | | * The IPv4 or IPv6 address or host name. |
| | | * @return {@code true} if the provided IPv4 or IPv6 address or host name |
| | | * represents the address of one of the interfaces on the current host |
| | | * machine. |
| | | */ |
| | | public static boolean isLocalAddress(String addressString) |
| | | { |
| | | try |
| | | { |
| | | return isLocalAddress(InetAddress.getByName(addressString)); |
| | | } |
| | | catch (UnknownHostException e) |
| | | { |
| | | return false; |
| | | } |
| | | } |
| | | |
| | | |
| | | |
| | | /** |
| | | * Returns {@code true} if the provided {@code InetAddress} represents the |
| | | * address of one of the interfaces on the current host machine. |
| | | * |
| | | * @param address |
| | | * The network address. |
| | | * @return {@code true} if the provided {@code InetAddress} represents the |
| | | * address of one of the interfaces on the current host machine. |
| | | */ |
| | | public static boolean isLocalAddress(InetAddress address) |
| | | { |
| | | return address.isLoopbackAddress() || getLocalAddresses().contains(address); |
| | | } |
| | | |
| | | // Time-stamp acts as memory barrier for networkInterfaces. |
| | | private static final long CACHED_LOCAL_ADDRESSES_TIMEOUT_MS = 30 * 1000; |
| | | private static volatile long localAddressesTimeStamp = 0; |
| | | private static Set<InetAddress> localAddresses = new HashSet<InetAddress>(); |
| | | |
| | | private static Set<InetAddress> getLocalAddresses() |
| | | { |
| | | final long currentTimeStamp = System.currentTimeMillis(); |
| | | if (localAddressesTimeStamp |
| | | < (currentTimeStamp - CACHED_LOCAL_ADDRESSES_TIMEOUT_MS)) |
| | | { |
| | | // Refresh the cache. |
| | | try |
| | | { |
| | | final Enumeration<NetworkInterface> i = NetworkInterface |
| | | .getNetworkInterfaces(); |
| | | final Set<InetAddress> newLocalAddresses = new HashSet<InetAddress>(); |
| | | while (i.hasMoreElements()) |
| | | { |
| | | NetworkInterface n = i.nextElement(); |
| | | Enumeration<InetAddress> j = n.getInetAddresses(); |
| | | while (j.hasMoreElements()) |
| | | { |
| | | newLocalAddresses.add(j.nextElement()); |
| | | } |
| | | } |
| | | localAddresses = newLocalAddresses; |
| | | } |
| | | catch (SocketException e) |
| | | { |
| | | // Ignore and keep the old set. |
| | | TRACER.debugCaught(DebugLogLevel.WARNING, e); |
| | | } |
| | | localAddressesTimeStamp = currentTimeStamp; // Publishes. |
| | | } |
| | | return localAddresses; |
| | | } |
| | | |
| | | /** |
| | | * Closes the provided {@link Closeable}'s ignoring any errors which |
| | | * occurred. |