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      1 // Copyright (c) 2002-2004 Brian Wellington (bwelling (at) xbill.org)
      2 
      3 package org.xbill.DNS;
      4 
      5 import java.io.*;
      6 import org.xbill.DNS.utils.*;
      7 
      8 /**
      9  * DLV - contains a Delegation Lookaside Validation record, which acts
     10  * as the equivalent of a DS record in a lookaside zone.
     11  * @see DNSSEC
     12  * @see DSRecord
     13  *
     14  * @author David Blacka
     15  * @author Brian Wellington
     16  */
     17 
     18 public class DLVRecord extends Record {
     19 
     20 public static final int SHA1_DIGEST_ID = DSRecord.Digest.SHA1;
     21 public static final int SHA256_DIGEST_ID = DSRecord.Digest.SHA1;
     22 
     23 private static final long serialVersionUID = 1960742375677534148L;
     24 
     25 private int footprint;
     26 private int alg;
     27 private int digestid;
     28 private byte [] digest;
     29 
     30 DLVRecord() {}
     31 
     32 Record
     33 getObject() {
     34 	return new DLVRecord();
     35 }
     36 
     37 /**
     38  * Creates a DLV Record from the given data
     39  * @param footprint The original KEY record's footprint (keyid).
     40  * @param alg The original key algorithm.
     41  * @param digestid The digest id code.
     42  * @param digest A hash of the original key.
     43  */
     44 public
     45 DLVRecord(Name name, int dclass, long ttl, int footprint, int alg,
     46 	  int digestid, byte [] digest)
     47 {
     48 	super(name, Type.DLV, dclass, ttl);
     49 	this.footprint = checkU16("footprint", footprint);
     50 	this.alg = checkU8("alg", alg);
     51 	this.digestid = checkU8("digestid", digestid);
     52 	this.digest = digest;
     53 }
     54 
     55 void
     56 rrFromWire(DNSInput in) throws IOException {
     57 	footprint = in.readU16();
     58 	alg = in.readU8();
     59 	digestid = in.readU8();
     60 	digest = in.readByteArray();
     61 }
     62 
     63 void
     64 rdataFromString(Tokenizer st, Name origin) throws IOException {
     65 	footprint = st.getUInt16();
     66 	alg = st.getUInt8();
     67 	digestid = st.getUInt8();
     68 	digest = st.getHex();
     69 }
     70 
     71 /**
     72  * Converts rdata to a String
     73  */
     74 String
     75 rrToString() {
     76 	StringBuffer sb = new StringBuffer();
     77 	sb.append(footprint);
     78 	sb.append(" ");
     79 	sb.append(alg);
     80 	sb.append(" ");
     81 	sb.append(digestid);
     82 	if (digest != null) {
     83 		sb.append(" ");
     84 		sb.append(base16.toString(digest));
     85 	}
     86 
     87 	return sb.toString();
     88 }
     89 
     90 /**
     91  * Returns the key's algorithm.
     92  */
     93 public int
     94 getAlgorithm() {
     95 	return alg;
     96 }
     97 
     98 /**
     99  *  Returns the key's Digest ID.
    100  */
    101 public int
    102 getDigestID()
    103 {
    104 	return digestid;
    105 }
    106 
    107 /**
    108  * Returns the binary hash of the key.
    109  */
    110 public byte []
    111 getDigest() {
    112 	return digest;
    113 }
    114 
    115 /**
    116  * Returns the key's footprint.
    117  */
    118 public int
    119 getFootprint() {
    120 	return footprint;
    121 }
    122 
    123 void
    124 rrToWire(DNSOutput out, Compression c, boolean canonical) {
    125 	out.writeU16(footprint);
    126 	out.writeU8(alg);
    127 	out.writeU8(digestid);
    128 	if (digest != null)
    129 		out.writeByteArray(digest);
    130 }
    131 
    132 }
    133