Examples with UnknownHostException java.net.UnknownHostException used on opensource projects

Example 6 with UnknownHostException

use of java.net.UnknownHostException in project hadoop by apache.

the class DNS method getIPs.

/**
   * Returns all the IPs associated with the provided interface, if any, in
   * textual form.
   * 
   * @param strInterface
   *            The name of the network interface or sub-interface to query
   *            (eg eth0 or eth0:0) or the string "default"
   * @param returnSubinterfaces
   *            Whether to return IPs associated with subinterfaces of
   *            the given interface
   * @return A string vector of all the IPs associated with the provided
   *         interface. The local host IP is returned if the interface
   *         name "default" is specified or there is an I/O error looking
   *         for the given interface.
   * @throws UnknownHostException
   *             If the given interface is invalid
   * 
   */
public static String[] getIPs(String strInterface, boolean returnSubinterfaces) throws UnknownHostException {
    if ("default".equals(strInterface)) {
        return new String[] { cachedHostAddress };
    }
    NetworkInterface netIf;
    try {
        netIf = NetworkInterface.getByName(strInterface);
        if (netIf == null) {
            netIf = getSubinterface(strInterface);
        }
    } catch (SocketException e) {
        LOG.warn("I/O error finding interface " + strInterface + ": " + e.getMessage());
        return new String[] { cachedHostAddress };
    }
    if (netIf == null) {
        throw new UnknownHostException("No such interface " + strInterface);
    }
    // NB: Using a LinkedHashSet to preserve the order for callers
    // that depend on a particular element being 1st in the array.
    // For example, getDefaultIP always returns the first element.
    LinkedHashSet<InetAddress> allAddrs = new LinkedHashSet<InetAddress>();
    allAddrs.addAll(Collections.list(netIf.getInetAddresses()));
    if (!returnSubinterfaces) {
        allAddrs.removeAll(getSubinterfaceInetAddrs(netIf));
    }
    String[] ips = new String[allAddrs.size()];
    int i = 0;
    for (InetAddress addr : allAddrs) {
        ips[i++] = addr.getHostAddress();
    }
    return ips;
}

Example 7 with UnknownHostException

use of java.net.UnknownHostException in project hadoop by apache.

the class NetUtils method createSocketAddrForHost.

/**
   * Create a socket address with the given host and port.  The hostname
   * might be replaced with another host that was set via
   * {@link #addStaticResolution(String, String)}.  The value of
   * hadoop.security.token.service.use_ip will determine whether the
   * standard java host resolver is used, or if the fully qualified resolver
   * is used.
   * @param host the hostname or IP use to instantiate the object
   * @param port the port number
   * @return InetSocketAddress
   */
public static InetSocketAddress createSocketAddrForHost(String host, int port) {
    String staticHost = getStaticResolution(host);
    String resolveHost = (staticHost != null) ? staticHost : host;
    InetSocketAddress addr;
    try {
        InetAddress iaddr = SecurityUtil.getByName(resolveHost);
        // address look like the original given host
        if (staticHost != null) {
            iaddr = InetAddress.getByAddress(host, iaddr.getAddress());
        }
        addr = new InetSocketAddress(iaddr, port);
    } catch (UnknownHostException e) {
        addr = InetSocketAddress.createUnresolved(host, port);
    }
    return addr;
}

Example 8 with UnknownHostException

use of java.net.UnknownHostException in project hadoop by apache.

the class ServerWebApp method resolveAuthority.

/**
   * Resolves the host and port InetSocketAddress the
   * web server is listening to.
   * <p>
   * This implementation looks for the following 2 properties:
   * <ul>
   *   <li>#SERVER_NAME#.http.hostname</li>
   *   <li>#SERVER_NAME#.http.port</li>
   * </ul>
   *
   * @return the host and port InetSocketAddress the
   *         web server is listening to.
   * @throws ServerException thrown
   *         if any of the above 2 properties is not defined.
   */
protected InetSocketAddress resolveAuthority() throws ServerException {
    String hostnameKey = getName() + HTTP_HOSTNAME;
    String portKey = getName() + HTTP_PORT;
    String host = System.getProperty(hostnameKey);
    String port = System.getProperty(portKey);
    if (host == null) {
        throw new ServerException(ServerException.ERROR.S13, hostnameKey);
    }
    if (port == null) {
        throw new ServerException(ServerException.ERROR.S13, portKey);
    }
    try {
        InetAddress add = InetAddress.getByName(host);
        int portNum = Integer.parseInt(port);
        return new InetSocketAddress(add, portNum);
    } catch (UnknownHostException ex) {
        throw new ServerException(ServerException.ERROR.S14, ex.toString(), ex);
    }
}

Example 9 with UnknownHostException

use of java.net.UnknownHostException in project hadoop by apache.

the class TaskAttemptImpl method resolveHost.

protected String resolveHost(String src) {
    // Fallback in case of failure.
    String result = src;
    try {
        InetAddress addr = InetAddress.getByName(src);
        result = addr.getHostName();
    } catch (UnknownHostException e) {
        LOG.warn("Failed to resolve address: " + src + ". Continuing to use the same.");
    }
    return result;
}

Example 10 with UnknownHostException

use of java.net.UnknownHostException in project hadoop by apache.

the class TestUdpServer method testRequest.

static void testRequest(XDR request, XDR request2) {
    try {
        DatagramSocket clientSocket = new DatagramSocket();
        InetAddress IPAddress = InetAddress.getByName("localhost");
        byte[] sendData = request.getBytes();
        byte[] receiveData = new byte[65535];
        DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, Nfs3Constant.SUN_RPCBIND);
        clientSocket.send(sendPacket);
        DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
        clientSocket.receive(receivePacket);
        clientSocket.close();
    } catch (UnknownHostException e) {
        System.err.println("Don't know about host: localhost.");
        System.exit(1);
    } catch (IOException e) {
        System.err.println("Couldn't get I/O for " + "the connection to: localhost.");
        System.exit(1);
    }
}