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The official Couchbase JVM Core IO Library
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 1999-2004 Brian Wellington ([email protected])
package com.couchbase.client.core.deps.org.xbill.DNS;
import java.io.IOException;
import java.util.BitSet;
/**
* Next name - this record contains the following name in an ordered list of names in the zone, and
* a set of types for which records exist for this name. The presence of this record in a response
* signifies a failed query for data in a DNSSEC-signed zone.
*
* @author Brian Wellington
* @see RFC 2065: Domain Name System Security
* Extensions
*/
public class NXTRecord extends Record {
private Name next;
private BitSet bitmap;
NXTRecord() {}
/**
* Creates an NXT Record from the given data
*
* @param next The following name in an ordered list of the zone
* @param bitmap The set of type for which records exist at this name
*/
public NXTRecord(Name name, int dclass, long ttl, Name next, BitSet bitmap) {
super(name, Type.NXT, dclass, ttl);
this.next = checkName("next", next);
this.bitmap = bitmap;
}
@Override
protected void rrFromWire(DNSInput in) throws IOException {
next = new Name(in);
bitmap = new BitSet();
int bitmapLength = in.remaining();
for (int i = 0; i < bitmapLength; i++) {
int t = in.readU8();
for (int j = 0; j < 8; j++) {
if ((t & (1 << (7 - j))) != 0) {
bitmap.set(i * 8 + j);
}
}
}
}
@Override
protected void rdataFromString(Tokenizer st, Name origin) throws IOException {
next = st.getName(origin);
bitmap = new BitSet();
while (true) {
Tokenizer.Token t = st.get();
if (!t.isString()) {
break;
}
int typecode = Type.value(t.value(), true);
if (typecode <= 0 || typecode > 128) {
throw st.exception("Invalid type: " + t.value());
}
bitmap.set(typecode);
}
st.unget();
}
/** Converts rdata to a String */
@Override
protected String rrToString() {
StringBuilder sb = new StringBuilder();
sb.append(next);
int length = bitmap.length();
for (short i = 0; i < length; i++) {
if (bitmap.get(i)) {
sb.append(" ");
sb.append(Type.string(i));
}
}
return sb.toString();
}
/** Returns the next name */
public Name getNext() {
return next;
}
/** Returns the set of types defined for this name */
public BitSet getBitmap() {
return bitmap;
}
@Override
protected void rrToWire(DNSOutput out, Compression c, boolean canonical) {
next.toWire(out, null, canonical);
int length = bitmap.length();
for (int i = 0, t = 0; i < length; i++) {
t |= bitmap.get(i) ? (1 << (7 - i % 8)) : 0;
if (i % 8 == 7 || i == length - 1) {
out.writeU8(t);
t = 0;
}
}
}
}