Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | // Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org) |
| 2 | |
| 3 | package org.xbill.DNS; |
| 4 | |
| 5 | import java.io.*; |
| 6 | import java.util.*; |
| 7 | |
| 8 | /** |
| 9 | * Next name - this record contains the following name in an ordered list |
| 10 | * of names in the zone, and a set of types for which records exist for |
| 11 | * this name. The presence of this record in a response signifies a |
| 12 | * failed query for data in a DNSSEC-signed zone. |
| 13 | * |
| 14 | * @author Brian Wellington |
| 15 | */ |
| 16 | |
| 17 | public class NXTRecord extends Record { |
| 18 | |
| 19 | private static final long serialVersionUID = -8851454400765507520L; |
| 20 | |
| 21 | private Name next; |
| 22 | private BitSet bitmap; |
| 23 | |
| 24 | NXTRecord() {} |
| 25 | |
| 26 | Record |
| 27 | getObject() { |
| 28 | return new NXTRecord(); |
| 29 | } |
| 30 | |
| 31 | /** |
| 32 | * Creates an NXT Record from the given data |
| 33 | * @param next The following name in an ordered list of the zone |
| 34 | * @param bitmap The set of type for which records exist at this name |
| 35 | */ |
| 36 | public |
| 37 | NXTRecord(Name name, int dclass, long ttl, Name next, BitSet bitmap) { |
| 38 | super(name, Type.NXT, dclass, ttl); |
| 39 | this.next = checkName("next", next); |
| 40 | this.bitmap = bitmap; |
| 41 | } |
| 42 | |
| 43 | void |
| 44 | rrFromWire(DNSInput in) throws IOException { |
| 45 | next = new Name(in); |
| 46 | bitmap = new BitSet(); |
| 47 | int bitmapLength = in.remaining(); |
| 48 | for (int i = 0; i < bitmapLength; i++) { |
| 49 | int t = in.readU8(); |
| 50 | for (int j = 0; j < 8; j++) |
| 51 | if ((t & (1 << (7 - j))) != 0) |
| 52 | bitmap.set(i * 8 + j); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | void |
| 57 | rdataFromString(Tokenizer st, Name origin) throws IOException { |
| 58 | next = st.getName(origin); |
| 59 | bitmap = new BitSet(); |
| 60 | while (true) { |
| 61 | Tokenizer.Token t = st.get(); |
| 62 | if (!t.isString()) |
| 63 | break; |
| 64 | int typecode = Type.value(t.value, true); |
| 65 | if (typecode <= 0 || typecode > 128) |
| 66 | throw st.exception("Invalid type: " + t.value); |
| 67 | bitmap.set(typecode); |
| 68 | } |
| 69 | st.unget(); |
| 70 | } |
| 71 | |
| 72 | /** Converts rdata to a String */ |
| 73 | String |
| 74 | rrToString() { |
| 75 | StringBuffer sb = new StringBuffer(); |
| 76 | sb.append(next); |
| 77 | int length = bitmap.length(); |
| 78 | for (short i = 0; i < length; i++) |
| 79 | if (bitmap.get(i)) { |
| 80 | sb.append(" "); |
| 81 | sb.append(Type.string(i)); |
| 82 | } |
| 83 | return sb.toString(); |
| 84 | } |
| 85 | |
| 86 | /** Returns the next name */ |
| 87 | public Name |
| 88 | getNext() { |
| 89 | return next; |
| 90 | } |
| 91 | |
| 92 | /** Returns the set of types defined for this name */ |
| 93 | public BitSet |
| 94 | getBitmap() { |
| 95 | return bitmap; |
| 96 | } |
| 97 | |
| 98 | void |
| 99 | rrToWire(DNSOutput out, Compression c, boolean canonical) { |
| 100 | next.toWire(out, null, canonical); |
| 101 | int length = bitmap.length(); |
| 102 | for (int i = 0, t = 0; i < length; i++) { |
| 103 | t |= (bitmap.get(i) ? (1 << (7 - i % 8)) : 0); |
| 104 | if (i % 8 == 7 || i == length - 1) { |
| 105 | out.writeU8(t); |
| 106 | t = 0; |
| 107 | } |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | } |