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// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
package org.xbill.DNS;
import java.io.*;
import java.net.*;
/**
* A6 Record - maps a domain name to an IPv6 address (experimental)
*
* @author Brian Wellington
*/
public class A6Record extends Record {
private static final long serialVersionUID = -8815026887337346789L;
private int prefixBits;
private InetAddress suffix;
private Name prefix;
A6Record() {}
Record
getObject() {
return new A6Record();
}
/**
* Creates an A6 Record from the given data
* @param prefixBits The number of bits in the address prefix
* @param suffix The address suffix
* @param prefix The name of the prefix
*/
public
A6Record(Name name, int dclass, long ttl, int prefixBits,
InetAddress suffix, Name prefix)
{
super(name, Type.A6, dclass, ttl);
this.prefixBits = checkU8("prefixBits", prefixBits);
if (suffix != null && Address.familyOf(suffix) != Address.IPv6)
throw new IllegalArgumentException("invalid IPv6 address");
this.suffix = suffix;
if (prefix != null)
this.prefix = checkName("prefix", prefix);
}
void
rrFromWire(DNSInput in) throws IOException {
prefixBits = in.readU8();
int suffixbits = 128 - prefixBits;
int suffixbytes = (suffixbits + 7) / 8;
if (prefixBits < 128) {
byte [] bytes = new byte[16];
in.readByteArray(bytes, 16 - suffixbytes, suffixbytes);
suffix = InetAddress.getByAddress(bytes);
}
if (prefixBits > 0)
prefix = new Name(in);
}
void
rdataFromString(Tokenizer st, Name origin) throws IOException {
prefixBits = st.getUInt8();
if (prefixBits > 128) {
throw st.exception("prefix bits must be [0..128]");
} else if (prefixBits < 128) {
String s = st.getString();
try {
suffix = Address.getByAddress(s, Address.IPv6);
}
catch (UnknownHostException e) {
throw st.exception("invalid IPv6 address: " + s);
}
}
if (prefixBits > 0)
prefix = st.getName(origin);
}
/** Converts rdata to a String */
String
rrToString() {
StringBuffer sb = new StringBuffer();
sb.append(prefixBits);
if (suffix != null) {
sb.append(" ");
sb.append(suffix.getHostAddress());
}
if (prefix != null) {
sb.append(" ");
sb.append(prefix);
}
return sb.toString();
}
/** Returns the number of bits in the prefix */
public int
getPrefixBits() {
return prefixBits;
}
/** Returns the address suffix */
public InetAddress
getSuffix() {
return suffix;
}
/** Returns the address prefix */
public Name
getPrefix() {
return prefix;
}
void
rrToWire(DNSOutput out, Compression c, boolean canonical) {
out.writeU8(prefixBits);
if (suffix != null) {
int suffixbits = 128 - prefixBits;
int suffixbytes = (suffixbits + 7) / 8;
byte [] data = suffix.getAddress();
out.writeByteArray(data, 16 - suffixbytes, suffixbytes);
}
if (prefix != null)
prefix.toWire(out, null, canonical);
}
}
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