110 lines
2.9 KiB
Java
110 lines
2.9 KiB
Java
// $Id$
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//
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// Copyright (C) 2000-2003 Network Solutions, Inc.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA
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package com.verisignlabs.dnssec.security;
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import java.util.Comparator;
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import org.xbill.DNS.RRSIGRecord;
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import org.xbill.DNS.Record;
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import org.xbill.DNS.Type;
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/**
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* This class implements a comparison operator for {@link org.xbill.DNS.Record}
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* objects. It imposes a canonical order consistent with DNSSEC. It does not put
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* records within a RRset into canonical order: see {@link ByteArrayComparator}.
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*
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* @author David Blacka (original)
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* @author $Author$
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* @version $Revision$
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*/
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public class RecordComparator implements Comparator<Record>
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{
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public RecordComparator()
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{
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}
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/**
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* In general, types are compared numerically. However, SOA, NS, and DNAME are ordered
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* before the rest.
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*/
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private int compareTypes(int a, int b)
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{
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if (a == b) return 0;
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if (a == Type.SOA) return -1;
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if (b == Type.SOA) return 1;
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if (a == Type.NS) return -1;
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if (b == Type.NS) return 1;
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if (a == Type.DNAME) return -1;
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if (b == Type.DNAME) return 1;
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if (a < b) return -1;
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return 1;
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}
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private int compareRDATA(Record a, Record b)
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{
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byte[] a_rdata = a.rdataToWireCanonical();
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byte[] b_rdata = b.rdataToWireCanonical();
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for (int i = 0; i < a_rdata.length && i < b_rdata.length; i++)
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{
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int n = (a_rdata[i] & 0xFF) - (b_rdata[i] & 0xFF);
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if (n != 0) return n;
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}
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return (a_rdata.length - b_rdata.length);
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}
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public int compare(Record a, Record b)
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{
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if (a == null && b == null) return 0;
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if (a == null) return 1;
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if (b == null) return -1;
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int res = a.getName().compareTo(b.getName());
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if (res != 0) return res;
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int a_type = a.getType();
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int b_type = b.getType();
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int sig_type = 0;
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if (a_type == Type.RRSIG)
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{
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a_type = ((RRSIGRecord) a).getTypeCovered();
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if (b_type != Type.RRSIG) sig_type = 1;
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}
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if (b_type == Type.RRSIG)
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{
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b_type = ((RRSIGRecord) b).getTypeCovered();
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if (a.getType() != Type.RRSIG) sig_type = -1;
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}
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res = compareTypes(a_type, b_type);
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if (res != 0) return res;
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if (sig_type != 0) return sig_type;
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return compareRDATA(a, b);
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}
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}
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