ImmutableSet.of("foo.bar.google.com", "a.b.co.uk", "x.y.ca.us", "a.b.blogspot.com");

  private static final ImmutableSet<String> VALID_IP_ADDRS =
      ImmutableSet.of("1.2.3.4", "127.0.0.1", "::1", "2001:db8::1");

  private static final ImmutableSet<String> INVALID_IP_ADDRS =
      ImmutableSet.of(
          "", "1", "1.2.3", "...", "1.2.3.4.5", "400.500.600.700", ":", ":::1", "2001:db8:");

    /**
     * Check whether a hostname is actually an ip address
     * 
     * @param hostname
     * @return whether this is an IP address
     */
    public static boolean isDotQuadIP ( String hostname ) {
        if ( Character.isDigit(hostname.charAt(0)) ) {
            int i, len, dots;
            char[] data;

            i = dots = 0; /* quick IP address validation */
            len = hostname.length();

 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

/**
 * Utility methods and classes for networking (such as IP addresses and domain names).
 *
 * <p>This package is a part of the open-source <a href="https://github.com/google/guava">Guava</a>
 * library.
 *
 * @author Craig Berry
 */
@CheckReturnValue

            valueMap.put(e.getKey(), e.getValue().replace('\t', '_'));
        });
        log(valueMap);
    }

    protected void log(final Map<String, String> valueMap) {
        valueMap.put("ip", getClientIp());
        valueMap.put("time", DateTimeFormatter.ISO_INSTANT.format(ZonedDateTime.now()));
        if (useEcsFormat) {
            printByEcs(valueMap);
        } else {
            printByLtsv(valueMap);

                log.error("Not a number", nfe);
            }
        }
        return def;
    }


    /**
     * Retrieve an <code>InetAddress</code>. If the address is not
     * an IP address and cannot be resolved <code>null</code> will
     * be returned.
     */
    public static InetAddress getInetAddress ( Properties props, String key, InetAddress def ) {
        String addr = props.getProperty(key);

                valueMap.remove("time");
                valueMap.remove("ip");
                super.printByLtsv(valueMap);
            }

            @Override
            protected void printByEcs(final Map<String, String> valueMap) {
                valueMap.put("time", "2022-01-01T00:00:00.000Z");
                valueMap.remove("ip");
                super.printByEcs(valueMap);
            }

            @Override

            char[] data;

            i = dots = 0;                    /* quick IP address validation */
            len = hostname.length();
            data = hostname.toCharArray();
            while( i < len && Character.isDigit( data[i++] )) {
                if( i == len && dots == 3 ) {
                    // probably an IP address
                    return true;
                }

    /**
     * 
     * @return the resolved host name, or the host address if it could not be resolved
     */
    String getHostName ();


    /**
     * Return the IP address as text such as "192.168.1.15".
     * 
     * @return the ip address
     */
    String getHostAddress ();


    /**
     * 
     * @return this address as an InetAddress
     * @throws UnknownHostException
     */

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs;


import java.net.UnknownHostException;


/**
 * This class represents a NetBIOS over TCP/IP address. Under normal
 * conditions, users of jCIFS need not be concerned with this class as
 * name resolution and session services are handled internally by the smb package.
 * 
 * <p>

                buf.append(hostname);
            }
            final String ip = ia.getHostAddress();
            if (StringUtil.isNotBlank(ip)) {
                if (buf.length() > 0) {
                    buf.append(" : ");
                }
                buf.append(ip);
            }
        } catch (final Exception e) {
            // ignore
        }