001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017package org.apache.logging.log4j.core.config.plugins.validation.validators; 018 019import org.apache.logging.log4j.Logger; 020import org.apache.logging.log4j.core.config.plugins.validation.ConstraintValidator; 021import org.apache.logging.log4j.core.config.plugins.validation.constraints.ValidHost; 022import org.apache.logging.log4j.status.StatusLogger; 023 024import java.net.InetAddress; 025import java.net.UnknownHostException; 026 027/** 028 * Validator that checks an object to verify it is a valid hostname or IP address. Validation rules follow the same 029 * logic as in {@link InetAddress#getByName(String)}. 030 * 031 * @since 2.8 032 */ 033public class ValidHostValidator implements ConstraintValidator<ValidHost> { 034 035 private static final Logger LOGGER = StatusLogger.getLogger(); 036 037 private ValidHost annotation; 038 039 @Override 040 public void initialize(final ValidHost annotation) { 041 this.annotation = annotation; 042 } 043 044 @Override 045 public boolean isValid(final String name, final Object value) { 046 if (value == null) { 047 LOGGER.error(annotation.message()); 048 return false; 049 } 050 if (value instanceof InetAddress) { 051 // InetAddress factory methods all have built in validation 052 return true; 053 } 054 try { 055 InetAddress.getByName(value.toString()); 056 return true; 057 } catch (final UnknownHostException e) { 058 LOGGER.error(annotation.message(), e); 059 return false; 060 } 061 } 062}