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      1 /*
      2  * Copyright 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package org.conscrypt;
     18 
     19 import java.util.regex.Pattern;
     20 
     21 /**
     22  * Utilities to check whether IP addresses meet some criteria.
     23  */
     24 public final class AddressUtils {
     25     /*
     26      * Regex that matches valid IPv4 and IPv6 addresses.
     27      */
     28     private static final String IP_PATTERN = "^(?:(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9]))|"
     29             + "(?i:(?:(?:[0-9a-f]{1,4}:){7}(?:[0-9a-f]{1,4}|:))|(?:(?:[0-9a-f]{1,4}:){6}(?::[0-9a-f]{1,4}|(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(?:\\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(?:(?:[0-9a-f]{1,4}:){5}(?:(?:(?::[0-9a-f]{1,4}){1,2})|:(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(?:\\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3})|:))|(?:(?:[0-9a-f]{1,4}:){4}(?:(?:(?::[0-9a-f]{1,4}){1,3})|(?:(?::[0-9a-f]{1,4})?:(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(?:\\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(?:(?:[0-9a-f]{1,4}:){3}(?:(?:(?::[0-9a-f]{1,4}){1,4})|(?:(?::[0-9a-f]{1,4}){0,2}:(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(?:\\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(?:(?:[0-9a-f]{1,4}:){2}(?:(?:(?::[0-9a-f]{1,4}){1,5})|(?:(?::[0-9a-f]{1,4}){0,3}:(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(?:\\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(?:(?:[0-9a-f]{1,4}:){1}(?:(?:(?::[0-9a-f]{1,4}){1,6})|(?:(?::[0-9a-f]{1,4}){0,4}:(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(?:\\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:))|(?::(?:(?:(?::[0-9a-f]{1,4}){1,7})|(?:(?::[0-9a-f]{1,4}){0,5}:(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(?:\\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}))|:)))$";
     30 
     31     private static Pattern ipPattern;
     32 
     33     private AddressUtils() {
     34     }
     35 
     36     /**
     37      * Returns true when the supplied hostname is valid for SNI purposes.
     38      */
     39     public static boolean isValidSniHostname(String sniHostname) {
     40         if (sniHostname == null) {
     41             return false;
     42         }
     43 
     44         // Must be a FQDN.
     45         if (sniHostname.indexOf('.') == -1) {
     46             return false;
     47         }
     48 
     49         if (Platform.isLiteralIpAddress(sniHostname)) {
     50             return false;
     51         }
     52 
     53         return true;
     54     }
     55 
     56     /**
     57      * Returns true if the supplied hostname is an literal IP address.
     58      */
     59     public static boolean isLiteralIpAddress(String hostname) {
     60         /* This is here for backwards compatibility for pre-Honeycomb devices. */
     61         Pattern ipPattern = AddressUtils.ipPattern;
     62         if (ipPattern == null) {
     63             AddressUtils.ipPattern = ipPattern = Pattern.compile(IP_PATTERN);
     64         }
     65         return ipPattern.matcher(hostname).matches();
     66     }
     67 }
     68