001/* 002 * Copyright 2015-2020 the original author or authors 003 * 004 * This software is licensed under the Apache License, Version 2.0, 005 * the GNU Lesser General Public License version 2 or later ("LGPL") 006 * and the WTFPL. 007 * You may choose either license to govern your use of this software only 008 * upon the condition that you accept all of the terms of either 009 * the Apache License 2.0, the LGPL 2.1+ or the WTFPL. 010 */ 011package org.minidns.constants; 012 013import java.net.Inet4Address; 014import java.net.Inet6Address; 015import java.net.InetAddress; 016import java.net.UnknownHostException; 017import java.util.HashMap; 018import java.util.Map; 019import java.util.Random; 020 021public class DnsRootServer { 022 023 private static final Map<Character, Inet4Address> IPV4_ROOT_SERVER_MAP = new HashMap<>(); 024 025 private static final Map<Character, Inet6Address> IPV6_ROOT_SERVER_MAP = new HashMap<>(); 026 027 protected static final Inet4Address[] IPV4_ROOT_SERVERS = new Inet4Address[] { 028 rootServerInet4Address('a', 198, 41, 0, 4), 029 rootServerInet4Address('b', 192, 228, 79, 201), 030 rootServerInet4Address('c', 192, 33, 4, 12), 031 rootServerInet4Address('d', 199, 7, 91 , 13), 032 rootServerInet4Address('e', 192, 203, 230, 10), 033 rootServerInet4Address('f', 192, 5, 5, 241), 034 rootServerInet4Address('g', 192, 112, 36, 4), 035 rootServerInet4Address('h', 198, 97, 190, 53), 036 rootServerInet4Address('i', 192, 36, 148, 17), 037 rootServerInet4Address('j', 192, 58, 128, 30), 038 rootServerInet4Address('k', 193, 0, 14, 129), 039 rootServerInet4Address('l', 199, 7, 83, 42), 040 rootServerInet4Address('m', 202, 12, 27, 33), 041 }; 042 043 protected static final Inet6Address[] IPV6_ROOT_SERVERS = new Inet6Address[] { 044 rootServerInet6Address('a', 0x2001, 0x0503, 0xba3e, 0x0000, 0x0000, 0x000, 0x0002, 0x0030), 045 rootServerInet6Address('b', 0x2001, 0x0500, 0x0084, 0x0000, 0x0000, 0x000, 0x0000, 0x000b), 046 rootServerInet6Address('c', 0x2001, 0x0500, 0x0002, 0x0000, 0x0000, 0x000, 0x0000, 0x000c), 047 rootServerInet6Address('d', 0x2001, 0x0500, 0x002d, 0x0000, 0x0000, 0x000, 0x0000, 0x000d), 048 rootServerInet6Address('f', 0x2001, 0x0500, 0x002f, 0x0000, 0x0000, 0x000, 0x0000, 0x000f), 049 rootServerInet6Address('h', 0x2001, 0x0500, 0x0001, 0x0000, 0x0000, 0x000, 0x0000, 0x0053), 050 rootServerInet6Address('i', 0x2001, 0x07fe, 0x0000, 0x0000, 0x0000, 0x000, 0x0000, 0x0053), 051 rootServerInet6Address('j', 0x2001, 0x0503, 0x0c27, 0x0000, 0x0000, 0x000, 0x0002, 0x0030), 052 rootServerInet6Address('l', 0x2001, 0x0500, 0x0003, 0x0000, 0x0000, 0x000, 0x0000, 0x0042), 053 rootServerInet6Address('m', 0x2001, 0x0dc3, 0x0000, 0x0000, 0x0000, 0x000, 0x0000, 0x0035), 054 }; 055 056 private static Inet4Address rootServerInet4Address(char rootServerId, int addr0, int addr1, int addr2, int addr3) { 057 Inet4Address inetAddress; 058 String name = rootServerId + ".root-servers.net"; 059 try { 060 inetAddress = (Inet4Address) InetAddress.getByAddress(name, new byte[] { (byte) addr0, (byte) addr1, (byte) addr2, 061 (byte) addr3 }); 062 IPV4_ROOT_SERVER_MAP.put(rootServerId, inetAddress); 063 } catch (UnknownHostException e) { 064 // This should never happen, if it does it's our fault! 065 throw new RuntimeException(e); 066 } 067 068 return inetAddress; 069 } 070 071 private static Inet6Address rootServerInet6Address(char rootServerId, int addr0, int addr1, int addr2, int addr3, int addr4, int addr5, int addr6, int addr7) { 072 Inet6Address inetAddress; 073 String name = rootServerId + ".root-servers.net"; 074 try { 075 inetAddress = (Inet6Address) InetAddress.getByAddress(name, new byte[] { 076 // @formatter:off 077 (byte) (addr0 >> 8), (byte) addr0, (byte) (addr1 >> 8), (byte) addr1, 078 (byte) (addr2 >> 8), (byte) addr2, (byte) (addr3 >> 8), (byte) addr3, 079 (byte) (addr4 >> 8), (byte) addr4, (byte) (addr5 >> 8), (byte) addr5, 080 (byte) (addr6 >> 8), (byte) addr6, (byte) (addr7 >> 8), (byte) addr7 081 // @formatter:on 082 }); 083 IPV6_ROOT_SERVER_MAP.put(rootServerId, inetAddress); 084 } catch (UnknownHostException e) { 085 // This should never happen, if it does it's our fault! 086 throw new RuntimeException(e); 087 } 088 return inetAddress; 089 } 090 091 public static Inet4Address getRandomIpv4RootServer(Random random) { 092 return IPV4_ROOT_SERVERS[random.nextInt(IPV4_ROOT_SERVERS.length)]; 093 } 094 095 public static Inet6Address getRandomIpv6RootServer(Random random) { 096 return IPV6_ROOT_SERVERS[random.nextInt(IPV6_ROOT_SERVERS.length)]; 097 } 098 099 public static Inet4Address getIpv4RootServerById(char id) { 100 return IPV4_ROOT_SERVER_MAP.get(id); 101 } 102 103 public static Inet6Address getIpv6RootServerById(char id) { 104 return IPV6_ROOT_SERVER_MAP.get(id); 105 } 106 107}